Highly Chemo- and Enantioselective Cross-Benzoin Reaction of Aliphatic Aldehydes and α-Ketoesters
作者:Karen Thai、Steven M. Langdon、François Bilodeau、Michel Gravel
DOI:10.1021/ol400769t
日期:2013.5.3
highly chemo- and enantioselective cross-benzoin reaction between aliphatic aldehydes and α-ketoesters. This methodology represents the first high yielding and highly enantioselective intermolecular cross-benzoin reaction using an organocatalyst (up to 94% ee). Further diastereoselectivereduction of the products gives access to densely oxygenated compounds with high chemo- and diastereoselectivity.
Dynamic Kinetic Asymmetric Cross-Benzoin Additions of β-Stereogenic α-Keto Esters
作者:C. Guy Goodman、Jeffrey S. Johnson
DOI:10.1021/ja508521a
日期:2014.10.22
The dynamickineticresolution of β-halo α-keto esters via an asymmetric cross-benzoin reaction is described. A chiral N-heterocycliccarbenecatalyzes the umpolung addition of aldehydes to racemic α-keto esters. The resulting fully substituted β-halo glycolic ester products are obtained with high levels of enantio- and diastereocontrol. The high chemoselectivity observed is a result of greater electrophilicity
2-AMINOBENZOXAZOLE CARBOXAMIDES AS 5HT3 MODULATORS
申请人:Yang Zhicai
公开号:US20080255114A1
公开(公告)日:2008-10-16
Compounds of formulae I, II and III:
are disclosed as 5-HT3 inhibitors. The compounds are useful in treating CINV, IBS-D and other diseases and conditions.
BICYCLIC ACETYL-COA CARBOXYLASE INHIBITORS AND USES THEREOF
申请人:BARNES David Weninger
公开号:US20120028969A1
公开(公告)日:2012-02-02
The present invention provides compounds of formula (I);
or pharmaceutically acceptable salts thereof, wherein the variables are defined as herein. The present invention provides a method for manufacturing the compounds of formula (I), their therapeutic uses, combinations with other of pharmacologically active agents, and a pharmaceutical compositions.
From Mono-Triazolium Salt to Bis-Triazolium Salt: Improvement of the Asymmetric Intermolecular Benzoin Condensation
作者:Yajun Ma、Siping Wei、Jie Wu、Fei Yang、Bo Liu、Jingbo Lan、Shengyong Yang、Jingsong You
DOI:10.1002/adsc.200800371
日期:2008.11.3
method for the enantioselective intermolecular benzoincondensation of aromatic aldehydes is described. The chiral bis-bicyclic triazolium salt – 1,3-bis(S)-5-benzyl-6,8-dihydro-5H-[1,4]oxazino[2,1-c][1,2,4]triazol-2-ium-2-yl}benzene dichloride [(S)-5a-1] is currently the most efficient precatalyst for the asymmetric variant of the benzoincondensation.
描述了解决开发高效率的方法用于芳族醛的对映选择性分子间安息香缩合的长期挑战的解决方案。手性双-双环三唑鎓盐– 1,3-双(S)-5-苄基-6,8-二氢-5 H- [1,4]恶嗪[2,1- c ] [1,2,4 ]三唑-2-鎓-2-基}苯二氯化物[(S)-5a-1 ]目前是用于安息香缩合反应的不对称变体的最有效的预催化剂。