Enantioselective total synthesis of (−)-strychnine: development of a highly practical catalytic asymmetric carbon–carbon bond formation and domino cyclization
An enantioselective totalsynthesis of (−)-strychnine was accomplished through the use of the highly practical catalyticasymmetricMichaelreaction (0.1 mol% of (R)-ALB, greater than kilogram scale, without chromatography, 91% yield and >99% ee), and a domino cyclization that simultaneously constructed the B- and D- rings of strychnine (>77% yield). Newly-developed reaction conditions for thionium
enantioselective total synthesis of (-)-strychnine was accomplished through the use of the highly practical catalytic asymmetricMichael reaction (0.1 mol % of (R)-ALB, more than kilogram scale, without chromatography, 91% yield and >99% ee) as well as a tandem cyclization that simultaneously constructed B- and D-rings (>77% yield). Moreover, newly developed reaction conditions for thionium ion cyclization, NaBH3CN
(-)-士的宁的对映选择性全合成是通过使用高度实用的催化不对称迈克尔反应(0.1 mol % (R)-ALB,超过千克规模,无需色谱,91%产率和>99%ee)完成的) 以及同时构建 B 环和 D 环的串联环化(> 77% 产率)。此外,新开发的硫鎓离子环化反应条件、在路易斯酸存在下亚胺部分的 NaBH3CN 还原以防止开环反应以及在环外烯烃存在下硫醚的化学选择性还原(脱硫)对于完成合成至关重要. 所描述的化学反应为合成更先进的马钱子生物碱铺平了道路。
2,5-DIOXOIMIDAZOLIDIN-1-YL-3-PHENYLUREA DERIVATIVES AS FORMYL PEPTIDE RECEPTOR LIKE-1 (FPRL-1) RECEPTOR MODULATORS
申请人:Allergan, Inc.
公开号:US20130123215A1
公开(公告)日:2013-05-16
The present invention relates to novel 2,5-dioxoimidazolidin-1-yl-3-phenylurea derivatives, processes for preparing them, pharmaceutical compositions containing them and their use as pharmaceuticals as modulators of the N-formyl peptide receptor like-1 (FPRL-1) receptor.
Heteroaryl substituted pyrrolo[2,3-b]pyridines and pyrrolo[2,3-b]pyrimidines as janus kinase inhibitors
申请人:Rodgers D. James
公开号:US20070135461A1
公开(公告)日:2007-06-14
The present invention provides heteroaryl substituted pyrrolo[2,3-b]pyridines and heteroaryl substituted pyrrolo[2,3-b]pyrimidines that modulate the activity of Janus kinases and are useful in the treatment of diseases related to activity of Janus kinases including, for example, immune-related diseases, skin disorders, myeloid proliferative disorders, cancer, and other diseases.
Facile KF/Alumina Mediated Synthesis of α-Heterosubstituted Weinreb Amides
作者:Marcus Tius、Jakob Busch-Petersen
DOI:10.1055/s-1997-6113
日期:1997.6
Anhydrous KF/alumina in dipolar aprotic solvents was found to be an effective promoter in the synthesis of α-heterosubstituted Weinreb amide prepared from 2-chloro-N-methoxy-N-methylacetamide. This method is highly yielding, even for weak nucleophiles, and requires no aqueous workup.