An insight into the t-butylbromide - dimethyl sulfoxide reagent: A novel application in lignan total synthesis.
摘要:
A novel aromatisation sequence initiated by the t-butylbromide - dimethyl sulfoxide reagent is presented. The unprecedented conversion of the dithianes 1 and 3 to the aryl sulfides 6 and 7 has lead to the synthesis of the naturally occuring 9-deoxyarylnaphthalene lignans taiwanin C and 1,2,3,4-dehydrodeoxypodophyllotoxin and gives a useful insight into the mechanism by which this unusual reagent acts.
A concise synthesis of taiwanin E using a michael initiated ring closure protocol
作者:David C. Harrowven
DOI:10.1016/s0040-4039(00)79781-4
日期:1991.7
A rapid entry towards the Podophyllumlignans is described exemplified by a concise regioseleclive total synthesis of taiwanin E (2). The synthesis features a Michael initiated ring closure sequence to access the key lignan intermediate (11) from the ketodithiolane (10) and the furanone (4).