Preparation of arylpropiolate esters from trichlorocyclopropenium cation and elaboration of the esters to unsymmetrical 1,4-pentadiyn-3-ones and unsymmetrical tellurapyranones
Axially asymmetric ester compound and production method thereof
申请人:Tanaka Ken
公开号:US20090299076A1
公开(公告)日:2009-12-03
To provide an axially asymmetric optically active biaryl ester compound that can easily produced without the step of optical resolution which was almost indispensable in conventional methods. There is provided a method for producing an axially asymmetric ester compound, comprising a cycloaddition of a compound having a triple bond with the use of a catalyst containing rhodium metal and an optically active bisphosphine.
The Diels–Alder cycloaddition reaction of tetracyclone and functionalized, internal aryl acetylenes gave access to a number of bulky atropisomeric biaryls in good to excellent yield. The synthesis is convenient and yields the pure biaryls without tedious work-up and purification procedures. Exemplarily the atropisomers have been resolved via the diastereomers in an easy and efficient manner to yield
Axiallychiral hydroxy carboxylic acid derivatives were successfully synthesized with high yields and ee values by the cationic rhodium(I)/axiallychiral biaryl bisphosphine complex-catalyzed enantioselective [2 + 2 + 2] cycloaddition. Axiallychiral hydroxy and dihydroxy carboxylic acid derivatives, bearing the aryl group at the ortho-position of the alkoxycarbonyl group, were also synthesized with