Development of chiral stabilised azomethine ylids: A chiral memory relay system.
摘要:
Chiral, stabilised azomethine ylids incorporated in cyclic templates derived from (R)- or (S)-2-phenylglycinol and (S)-valine undergo enantioselective 1,3-dipolar cycloaddition reactions with a variety of dipolarophiles. Removal of the template in the case of adducts derived originally from (S)-valine furnishes enantiomerically pure alpha-substituted proline derivatives.
DOI:
10.1016/s0957-4166(00)80031-2
作为产物:
描述:
(5R)-3-Isopropyl-5-phenyl-5,6-dihydro-2H-1,4-oxazin-2-one 在
二氧化铂氮气 、 氢气 、 crude product 、 silica 、 petrol 、 乙醚 作用下,
以
二氯甲烷 为溶剂,
反应 5.0h,
以to furnish the title product as a waxy solid (662 mg, 64%)的产率得到3(S)-isopropyl-5(S)-phenylmorpholine
The present invention provides a process comprising substitution of an acceptor molecule comprising a group —XC(O)— wherein X is O, S or NR
8
, where R
8
is C
1-6
alkyl, C
6-12
aryl or hydrogen, with a nucleophile, wherein the acceptor molecule is cyclised such that said nucleophilic substitution at —XC(O)— occurs without racemisation. This process has particular application for the production of a peptide by extension from the activated carboxy-terminus of an acyl amino acid residue without epimerisation.
Development of chiral stabilised azomethine ylids: A chiral memory relay system.
作者:Amberley S. Anslow、Laurence M. Harwood、Helen Phillips、David Watkin、Ling F. Wong
DOI:10.1016/s0957-4166(00)80031-2
日期:1991.1
Chiral, stabilised azomethine ylids incorporated in cyclic templates derived from (R)- or (S)-2-phenylglycinol and (S)-valine undergo enantioselective 1,3-dipolar cycloaddition reactions with a variety of dipolarophiles. Removal of the template in the case of adducts derived originally from (S)-valine furnishes enantiomerically pure alpha-substituted proline derivatives.
Asymmetric synthesis of peptides
申请人:University of Reading
公开号:US08044173B2
公开(公告)日:2011-10-25
A process comprising substitution of an acceptor molecule comprising a group —XC(O)— wherein X is O, S, or NR8, where R8 is C1-6 alkyl, C6-12 aryl or hydrogen, with a nucleophile, wherein the acceptor molecule is cyclised such that said nucleophilic substitution at —XC(O)— occurs without racemisation, is provided. This process has particular application for the production of a peptide by extension from the activated carboxy-terminus of an acyl amino acid residue without epimerisation.