Enantioselective Michael additions of aldehydes to nitroalkenes catalyzed with ionically tagged organocatalyst
作者:Radovan Šebesta、Attila Latika
DOI:10.2478/s11532-013-0391-4
日期:2014.3.1
Enantioselective organocatalytic Michaeladditions affords useful building blocks for many biologically and medicinally relevant compounds. Ionically-tagged diphenylprolinol silyl ether efficiently catalyzes several Michaeladditions of aldehydes to nitroalkenes in ionicliquids. The Michaeladditions work well in ionicliquids; yields up to 95% and enantioselectivities up to 95% ee were achieved.
INTERMEDIATE COMPOUNDS OF TAMIFLU, METHODS OF PREPARATION AND USES THEREOF
申请人:Ma Dawei
公开号:US20140221662A1
公开(公告)日:2014-08-07
Chiral amino compounds, methods of preparation and uses thereof. Tamiflu can be obtained from the said compounds. Multi-substituted chiral tetrahydropyrrolyl amine which can be used as intermediate compounds of medicament can also be produced by the said compounds.
Time Economical Total Synthesis of (−)-Oseltamivir
作者:Yujiro Hayashi、Shin Ogasawara
DOI:10.1021/acs.orglett.6b01595
日期:2016.7.15
A time economical 60 min total synthesis of (−)-oseltamivir was accomplished in a single reaction vessel over five steps. One of the key issues is reduction in the number of steps by eliminating lengthy reaction steps with substitution of a rapid epimerization step. A catalytic system consisting of three reagents, namely, diphenylprolinol silyl ether, thiourea, and acid, was developed for a rapid asymmetric
Organocatalytic Asymmetric Michael Addition of 3-Pyrrolyloxindoles to β-Phthalimidonitroethene for the Synthesis of 3,3′-Disubstituted Oxindoles Bearing Contiguous 3,α,β-Triamino Functionality
An organocatalyticasymmetric Michael addition reaction of 3-pyrrolyloxindoles to β-phthalimidonitroethene has been developed with a bifunctional thiourea–tertiary amine as the catalyst. A range of 3,3′-disubstituted oxindoles bearing contiguous 3,α,β-triamino functionality could be obtained in high yields with good diastereoselectivities and high enantioselectivities (up to 99% yield, 99:1 dr, and