documentclass{scrreprt}
usepackage[ngerman]{babel}
usepackage{filecontents}
usepackage{xcolor}
usepackage{manyfoot}
usepackage[babel]{csquotes}
usepackage[backend=biber,style=chem-angew,mcite,subentry]{biblatex}
usepackage{hyperref}
hypersetup{%
    colorlinks,
    linkcolor={red!0!black},
    citecolor={blue!0!black},
    urlcolor={blue!80!black}
}

ExecuteBibliographyOptions{citetracker=true,sorting=none,maxcitenames=10,doi=false,url=false,isbn=false,hyperref=true,backref=false}

DefineBibliographyStrings{ngerman}{
   andothers = {textit{et~aladddot}}
}

% Citation footnotes: use footnoteA
DeclareNewFootnote{A}

% Vanilla footnotes: use footnoteB
DeclareNewFootnote{B}

% Number of each bibliography entry in brackets
DeclareFieldFormat{labelnumberwidth}{mkbibbrackets{#1}}

makeatletter

newtoggle{cbx@togcite}

% Citation number superscript in brackets
renewcommand@makefntext[1]{%
  iftoggle{cbx@togcite}
    {@textsuperscript{normalfont[@thefnmark]}enspace #1}
    {@textsuperscript{normalfont@thefnmark}enspace #1}%
  globaltogglefalse{cbx@togcite}}

% Citation number superscript in brackets (for babel french)
ifdef{@makefntextFB}{%
renewcommand@makefntextFB[1]{%
  iftoggle{cbx@togcite}
    {@textsuperscript{normalfont[@thefnmark]}enspace #1}
    {@textsuperscript{normalfont@thefnmark}enspace #1}%
  globaltogglefalse{cbx@togcite}}}{}

%---------------------------------------------------------------
% Mostly verbatim from Joseph Wright
% http://www.texdev.net/2010/03/08/biblatex-numbered-citations-as-footnotes/

DeclareCiteCommand{sfcite}[cbx@superscript]%
  {usebibmacro{cite:init}%
   letmulticitedelim=supercitedelim
   iffieldundef{prenote}
     {}
     {BibliographyWarning{Ignoring prenote argument}}%
   iffieldundef{postnote}
     {}
     {BibliographyWarning{Ignoring postnote argument}}}
  {usebibmacro{citeindex}%
   usebibmacro{sfcite}%
   usebibmacro{cite:comp}}
  {}
  {usebibmacro{cite:dump}}

newbibmacro*{sfcite}{%
  ifciteseen
  {}
  {xapptocbx@citehook{%
   globaltoggletrue{cbx@togcite}%
   noexpandfootnotetextA[thefield{labelnumber}]{%
     fullcite{thefield{entrykey}}addperiod}}}}

newrobustcmd{cbx@superscript}[1]{%
  mkbibsuperscript{mkbibbrackets{#1}}%
  cbx@citehook%
  globalletcbx@citehook=empty}

letcbx@citehook=empty
%---------------------------------------------------------------

makeatother


begin{filecontents}{jobname.bib}
@Article{Frank1953,
  author  = {Frank, F. C.},
  title   = {On spontaneous asymmetric synthesis},
  journal = {Biochim. Biophys. Acta},
  year    = {1953},
  volume  = {11},
  pages   = {459-463},
  doi     = {http://dx.doi.org/10.1016/0006-3002(53)90082-1},
  url     = {http://www.sciencedirect.com/science/article/pii/0006300253900821},
}

@Article{Kagan1986,
  author  = {Puchot, C. and Samuel, O. and Dunach, E. and Zhao, S. and Agami, C. and Kagan, H. B.},
  title   = {Nonlinear effects in asymmetric synthesis. Examples in asymmetric oxidations and aldolization reactions},
  journal = {J. Am. Chem. Soc.},
  year    = {1986},
  volume  = {108},
  number  = {9},
  pages   = {2353-2357},
  doi     = {10.1021/ja00269a036},
  url     = {http://dx.doi.org/10.1021/ja00269a036},
}

@article{Soai1995,
   author = {Soai, Kenso and Shibata, Takanori and Morioka, Hiroshi and Choji, Kaori},
   title = {Asymmetric autocatalysis and amplification of enantiomeric excess of a chiral molecule},
   journal = {Nature},
   year = {1995},
   volume = {378},
   number = {6559},
   pages = {767-768},
   url = {http://dx.doi.org/10.1038/378767a0}
}

@Article{Brown2001,
  author  = {Blackmond, Donna G. and McMillan, Christopher R. and Ramdeehul, Shailesh and Schorm, Andrea and Brown, John M.},
  title   = {Origins of Asymmetric Amplification in Autocatalytic Alkylzinc Additions},
  journal = {J. Am. Chem. Soc.},
  year    = {2001},
  volume  = {123},
  number  = {41},
  pages   = {10103-10104},
  doi     = {10.1021/ja0165133},
  url     = {http://dx.doi.org/10.1021/ja0165133},
}
end{filecontents}

addbibresource{jobname.bib}

newbibmacro{string+doiurlisbn}[1]{%
  iffieldundef{doi}{%
    iffieldundef{url}{%
      iffieldundef{isbn}{%
        iffieldundef{issn}{%
          #1%
        }{%
          href{http://books.google.com/books?vid=ISSNthefield{issn}}{#1}%
        }%
      }{%
        href{http://books.google.com/books?vid=ISBNthefield{isbn}}{#1}%
      }%
    }{%
      href{thefield{url}}{#1}%
    }%
  }{%
    href{https://doi.org/thefield{doi}}{#1}%
  }%
}

DeclareFieldFormat{journaltitle}{usebibmacro{string+doiurlisbn}{mkbibemph{#1}}}

begin{document}
chapter{Title}
nullvfillnoindent
Vanilla footnote.footnoteB{This is a very very very very very very very very very very very very very very very very very very long Vanilla footnote text.}
First citation.sfcite{Frank1953}
First citation.sfcite{Kagan1986}
Vanilla footnote.footnoteB{Vanilla footnote text.}
First ``multi'' citation.sfcite{Frank1953,Kagan1986,Soai1995}
chapter{Title}
nullvfillnoindent
Second citation.sfcite{Frank1953}
Vanilla footnote.footnoteB{Vanilla footnote text.}
Second citation.sfcite{Soai1995}
Second citation.sfcite{Kagan1986}footnoteB{Vanilla footnote text.}
First citation.sfcite{Brown2001}
printbibliography
end{document}

usepackage[hang]{footmisc}
setlengthfootnotemargin{10pt}

deffootnote[1em]{1em}{1em}{%
  textsuperscript{makebox[1em][l]{thefootnotemark}}}