PROCESS FOR PREPARATION OF OPTICALLY ACTIVE ALLENES
申请人:Japan Science and Technology Agency
公开号:EP1482054A1
公开(公告)日:2004-12-01
The present invention provides a process for producing an optically active allene represented by formula (1):
wherein R2 and R3 are different and each represents a hydrogen atom, an optionally substituted C1-20 alkyl group or an optionally substituted C6-20 aryl group, and R4 represents an acyl group, which comprises reacting an allene derivative represented by formula (2)
wherein R1 represents a hydrogen atom or an optionally substituted acyl group and R2 and R3 have the same meaning as defined above, with an acylating agent having an acyl group represented by R4 when both R1s are each a hydrogen atom or with water when both R1s are each an acyl group represented by R4, in the presence of an enzyme catalyst. According to this production process, an optically active allene can be produced efficiently and enantioselectively from an allene derivative having a symmetrical structure.
Process for preparation of optically active allenes
申请人:Suzuki Keisuke
公开号:US20050106692A1
公开(公告)日:2005-05-19
The present invention provides a process for producing an optically active allene represented by formula (1):
wherein R
2
and R
3
are different and each represents a hydrogen atom, an optionally substituted C
1-20
alkyl group or an optionally substituted C
6-20
aryl group, and R
4
represents an acyl group, which comprises reacting an allene derivative represented by formula (2):
wherein R
1
represents a hydrogen atom or an optionally substituted acyl group and R
2
and R
3
have the same meaning as defined above, with an acylating agent having an acyl group represented by R
4
when both R
1
s are each a hydrogen atom or with water when both R
1
s are each an acyl group represented by R
4
, in the presence of an enzyme catalyst. According to this production process, an optically active allene can be produced efficiently and enantioselectively from an allene derivative having a symmetrical structure.
US7326559B2
申请人:——
公开号:US7326559B2
公开(公告)日:2008-02-05
Enantioselective Synthesis of Axially Chiral Tetrasubstituted Allenes via Lipase-Catalyzed Desymmetrization
作者:Jan Deska、Matthias Hammel
DOI:10.1055/s-0032-1317524
日期:——
transesterification of prochiral tetrasubstituted allenic diols yielding highly enantioenriched axiallychiral allenyl monoesters. In combination with subsequent 5-endo-trig cyclizations geminally disubstituted dihydrofurans are accessible in high optical purity. Lipase from Pseudomonas fluorescens efficiently catalyzes the transesterification of prochiral tetrasubstituted allenic diols yielding highly