New, Facile Synthesis of 3,3-Disubstituted Phthalides Based on the Reaction of α-Substituted 2-Lithiostyrenes with Carbon Dioxide
摘要:
A new method to prepare 3,3-disubstituted phthalides [isobenzofuran-1(3H)-ones] from alpha-substituted 2-bromostyrenes has been developed. The reaction of alpha-substituted 2-lithiostyrenes, generated in situ by bromine-lithium exchange between alpha-substituted 2-bromostyrenes and butyllithium, with carbon dioxide gave the corresponding lithium 2-vinylbenzoates, which upon treatment with concentrated hydrochloric acid afforded the desired products in one pot.
New, Facile Synthesis of 3,3-Disubstituted Phthalides Based on the Reaction of α-Substituted 2-Lithiostyrenes with Carbon Dioxide
摘要:
A new method to prepare 3,3-disubstituted phthalides [isobenzofuran-1(3H)-ones] from alpha-substituted 2-bromostyrenes has been developed. The reaction of alpha-substituted 2-lithiostyrenes, generated in situ by bromine-lithium exchange between alpha-substituted 2-bromostyrenes and butyllithium, with carbon dioxide gave the corresponding lithium 2-vinylbenzoates, which upon treatment with concentrated hydrochloric acid afforded the desired products in one pot.
Cobalt-Catalyzed Enantio- and Diastereoselective Intramolecular Hydroacylation of Trisubstituted Alkenes
作者:Junfeng Yang、Alice Rérat、Yang Jie Lim、Corinne Gosmini、Naohiko Yoshikai
DOI:10.1002/anie.201611518
日期:2017.2.20
Enantio‐ and diastereoselectivesynthesis of trans‐2,3‐disubstituted indanones is achieved by intramolecular hydroacylation of 2‐alkenylbenzaldehydes bearing trisubstituted alkenyl groups under cobalt‐chiral diphosphinecatalysis. Notably, a high level of enantioselectivity is induced regardless of the stereochemistry (E/Z ratio) of the alkenyl group of the starting material. Deuterium‐labeling experiments
Pd-catalyzed intermolecular consecutive double Heck reaction “on water” under air: facile synthesis of substituted indenes
作者:Dong Wei、Han-Yu Lu、Han-Zhe Miao、Chen-Guo Feng、Guo-Qiang Lin、Yingbin Liu
DOI:10.1039/d3ra03510g
日期:——
An efficient and environmentally benign method for the preparation of substituted indene derivatives has been developed by using water as the sole solvent. This reaction proceeded under air, tolerated a wide range of functional-groups and was easily scaled up. Bioactive natural products like indriline were synthesized via the developed protocol. Preliminary results demonstrate that the enantioselective
A new and short process has been developed for the preparation of 1,1,3-tri- and 1,1,3,3-tetra-substituted 1,3-dihydroisobenzofurans (phthalanes) from alpha-substituted 2-bromostyrenes. The method involves addition of a-substituted 2-lithiostyrenes, generated by the bromine-lithium exchange between alpha-substituted 2-bromostyrenes and butyllithium, to aliphatic aldehydes or ketones, followed by hydriodic acid catalyzed cyclization of the resulting 2-vinylbenzyl alcohols.