Efficient coupling reactions of lithium alkynyl(triisopropoxy)borates with aryl halides: application to the antifungal terbinafine synthesis
作者:Chang Ho Oh、Seung Hyun Jung
DOI:10.1016/s0040-4039(00)01543-4
日期:2000.10
Thermally stable lithiumalkynyl(triisopropoxy)borates were reacted with several aryl halides in the presence of palladium catalysts to give the corresponding cross-coupling products in excellent yields. The present methodology has been successfully applied to the antifungal terbinafine synthesis.
Intramolecular cyclizations of cyclopropenes with indole
作者:Peng-Long Zhu、Xiang-Ying Tang、Min Shi
DOI:10.1039/c6cc02226j
日期:——
Novel intramolecular cycloisomerizations of nitrogen-tethered cyclopropenes with indole in the presence of Bronsted acid have been developed. The reaction proceeded through the same pathway but stopped at different stage according...
A new reagent Na2S/MeOH for silyl deprotection has been developed. The reagent has several advantages which include deprotection of C-TMS, O-TMS, O-TBS, and O-TBDPS, selective removal of C-TMS and O-TMS in the presence of O-TBS and simultaneous desilylation and sulfide formation in one pot. (c) 2015 Elsevier Ltd. All rights reserved.
Enantioselective synthesis of (−)-cytoxazone and (+)-epi-cytoxazone, novel cytokine modulators via Sharpless asymmetric epoxidation and l-proline catalyzed Mannich reaction
作者:Abhimanyu S. Paraskar、Arumugam Sudalai
DOI:10.1016/j.tet.2006.03.079
日期:2006.6
A short and efficient enantioselective synthesis of (−)-cytoxazone and its stereoisomer (+)-epi-cytoxazone, novelcytokinemodulators, has been described with good yield and enantioselectivity. Ti-catalyzed Sharpless asymmetric epoxidation of allyl alcohol and l-proline catalyzed three-component Mannich reaction constitute the key steps in introducing stereogenicity into the molecule.
Highly selective synthesis of tetra-substituted furans and cyclopropenes: copper(i)-catalyzed formal cycloadditions of internal aryl alkynes and diazoacetates
作者:Andrew K. Swenson、Kate E. Higgins、Matthew G. Brewer、William W. Brennessel、Michael G. Coleman
DOI:10.1039/c2ob26295a
日期:——
A convenient Cu(I)-catalyzed cycloaddition of electron rich internal aryl alkynes and diazoacetates was discovered for the chemoselective and regioselective synthesis of tetra-substituted furans and cyclopropenes in moderate isolated yields (18–67%), and alkyne conversion (29–73%).