Asymmetric synthesis of 1-alkynylcyclopropane-1-carboxylates
摘要:
Dirhodium tetrakis(S-(N-dodecylbenzenesulfonyl)prolinate)(Rh2S-DOSP4) catalyzed decomposition of methyl alkynyldiazoacetates in the presence of alkenes results in highly diastereoselective and enantioselective cyclopropanations. (C) 2000 Published by Elsevier Science Ltd.
Functionalized diarylisoxazoles inhibitors of ciclooxygenase
申请人:Scilimati Antonio
公开号:US20090181970A1
公开(公告)日:2009-07-16
The present invention refers to isoxazole derivatives, in particular diarylisoxazole derivatives inhibitors of cyclooxygenase (COX), in particular cyclooxygenase-1 (COX-1), to their pharmaceutical compositions, the process for their preparation and their use for the chemoprevention and treatment of inflammatory syndromes and in the prevention and treatment of carcinomas, in particular intestinal, ovarian and cutaneous carcinomas, in the treatment of pain syndromes, in particular after surgery, and in the cardiovascular field as antithrombotics/vasoprotectives/cardioprotectives.
Alkynylation of α-halocarbonyl compounds—a Stille-type cross-coupling for the formation of C(sp)–C(sp<sup>3</sup>) bonds under neutral conditions
作者:Wei Shi、Chao Liu、Zai Yu、Aiwen Lei
DOI:10.1039/b703221h
日期:——
A direct alkynylation of readily available α-halo esters and amides with high yields is described herein; a distinct switch from diyne formation to alkynylation products was attained under neutral conditions.
Enantioselective Phosphine-Catalyzed Trimerization of γ-Aryl-3-butynoates via Isomerization/[3 + 2] Cyclization/Michael Addition Cascade
作者:Yujia Gao、Juan Zhang、Wenyu Shan、Weihong Fei、Jinzhong Yao、Weijun Yao
DOI:10.1021/acs.orglett.1c02197
日期:2021.8.20
We disclose an l-isoleucine-derived amide phosphine-catalyzed trimerization of γ-aryl-3-butynoates, which undergo an isomerization to allenoate, [3 + 2] cyclization, and Michaeladdition cascade. Exocyclopentene derivatives bearing an all-carbon quaternary stereocenter were constructed stereospecifically and enantioselectively. A wide variety of γ-aryl-3-butynoates could be employed to deliver optically
Lewis Acid Catalyzed Intramolecular [4+2] and [3+2] Cross-Cycloaddition of Alkynylcyclopropane Ketones with Carbonyl Compounds and Imines
作者:Yu Bai、Weijie Tao、Jun Ren、Zhongwen Wang
DOI:10.1002/anie.201200450
日期:2012.4.23
One brick, two bridges: The choice of the catalyzingLewisacid (LA, π: π‐electrophilic, σ: σ‐electrophilic) determines the pathway ([4+2] or [3+2]) of catalytic intramolecularcycloaddition reactions (IMCCs) of alkynylcyclopropane (ACP) ketone. This method provides a general strategy for stereoselective construction of structurally diverse bridged oxa‐/aza‐[n.3.1] and oxa‐/aza‐[n.2.1] skeletons (see
Regio- and stereoselective vinylic substitution reactions of α-haloenyne sulfones
作者:Mitsuhiro Yoshimatsu、Junko Hasegawa
DOI:10.1016/0040-4039(96)01682-6
日期:1996.10
The nucleophilicvinylicsubstitution reaction of (E)-α-haloenyne sulfones 2, 5–8 with sodium alkoxides proceeded regioselectively to give (E)-α-alkoxyenyne sulfones 9–17 in high yields with exclusive retention of their configuration.