Enantio- and diastereoselective hetero-Diels–Alder reactions between 2-aza-3-silyloxy-1,3-butadienes and aldehydes catalyzed by chiral dirhodium(ii) carboxamidates
Hetero-Diels-Alder (HDA) Strategy for the Preparation of 6-Aryl- and Heteroaryl-Substituted Piperidin-2-one Scaffolds: Experimental and Theoretical Studies
Preparation of piperidine-2-one scaffolds by the hetero-Diels–Alder (HAD) reaction, assisted by microwaves, is described. The versatility of this new approach has been demonstrated by the synthesis of racemic (±)-2-phenylpiperidine. Theoretical calculations have allowed us to clarify the factors that govern ring closure to form four-membered rings, arising from a Staudinger-type electrocyclization
描述了在微波辅助下通过异狄尔斯-阿尔德 (HAD) 反应制备哌啶-2-one 支架。这种新方法的多功能性已通过外消旋 (±)-2-苯基哌啶的合成得到证明。理论计算使我们能够阐明控制闭环形成四元环的因素,由施陶丁格型电环化产生,和/或通过经典的 [4+2] HAD 环化产生六元环。正如计算研究所预期的那样,可以通过增加亲二烯体的电子需求来降低这种竞争。
Spiroindolinone derivatives
申请人:Chen Li
公开号:US20070213341A1
公开(公告)日:2007-09-13
The present invention relates to spiroindolinone derivatives of the formula
and enantiomers and pharmaceutically acceptable salts and esters thereof which have utility as antiproliferative agents, especially, as anticancer agents.
Enantio- and diastereoselective hetero-Diels–Alder reactions between 2-aza-3-silyloxy-1,3-butadienes and aldehydes catalyzed by chiral dirhodium(ii) carboxamidates
The first catalytic asymmetric hetero-DielsâAlder reaction between 2-aza-3-silyloxy-1,3-butadienes and aldehydes is described. With dirhodium(II) tetrakis[N-benzene-fused-phthaloyl-(S)-piperidinonate], Rh2(S-BPTPI)4, the cycloaddition reaction proceeded exclusively in an endo mode to give all-cis-substituted 1,3-oxazinan-4-ones in high yields with up to 98% ee.
The present invention relates to spiroindolinone derivatives of the formula
and their enantiomers and pharmaceutically acceptable salts and esters thereof wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
and R
8
, are as herein described.
The compounds have utility as antiproliferative agents, especially, as anticancer agents.