Synthesis of synthons: The asymmetric hydrogenation and subsequent in situ lactonization with Ru-diphosphines results in the direct conversion of a series of 2-acylarylcarboxylates including 2-aroylarylcarboxylates into the corresponding optically active 3-substituted phthalides under mild reaction conditions.
Enantioselective addition of arylboronic acids to methyl 2-formylbenzoates by using a ruthenium/Me-BIPAM catalyst for synthesis of chiral 3-aryl-isobenzofuranones
作者:Masaaki Yohda、Yasunori Yamamoto
DOI:10.1039/c5ob01661d
日期:——
Ruthenium/Me-BIPAM-catalyzed asymmetric addition of arylboronicacids to methyl 2-formylbenzoates afforded chiral 3-aryl-isobenzofuranones. [RuCl2(p-cymene)]2/Me-BIPAM and RuCl2(PPh3)3/Me-BIPAM catalyst systems tolerate a variety of functional groups and give high yields with high enantioselectivities.
Catalytic Enantioselective Synthesis of Chiral Phthalides by SmI<sub>2</sub>-Mediated Reductive Cyclization of 2-Acylarylcarboxylates
作者:Ling-Lin Huang、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1021/ja061114z
日期:2006.5.1
A significant new and efficient catalytic asymmetric approach for the highly enantioselectivesynthesis of chiralphthalides by SmI2-induced reductivecyclization of 2-acylarylcarbonylates was developed. The combination of (4S,5R)-4,5-diphenyloxazolidin-2-one and 2,2,6,6-tetramethylpiperidine was found to be a very effective catalyst system in the reaction. This method provides a ready access to a
A nickel-catalyzed asymmetric Suzuki–Miyaura cross-coupling of racemic 3-bromo-phthalides and arylboronic acids was realized for the synthesis of diverse chiral 3-aryl-phthalides in moderate to excellent reaction yields. The reaction proceeded in a stereoconvergent manner and high enantioselectivities were observed for most examined examples. A number of functional groups like aldehyde, ester and bromide
A facile and convenient synthesis of the chiral phthalide framework catalyzed by cationic iridium was developed. The method utilized cationic iridium/bisphosphine‐catalyzed asymmetric intramolecular carbonyl hydroacylation of 2‐keto benzaldehydes to furnish the corresponding optically active phthalide products in good to excellent enantioselectivities (up to 98% ee ). The mechanistic studies using