名称:
First total syntheses of the 1,2,3,4-tetrahydronaphtho[2,1-f]isoquinolines annoretine and litebamine
摘要:
We describe here the first total synthesis of the two natural 1,2,3,4-tetrahydronaphtho[2,1-f]isoquinolines, annoretine and litebamine, from [2-(2-styrylphenyl)ethyl]methylcarbamic acid ethyl esters. The key steps were the Bischler-Napieralski cyclization to form the isoquinoline unit and photocyclization of the resulting 2-methyl-5-styryl-3,4-dihydro-2H-isoquinolin-1-ones to 2-methyl-3,4-dihydro-2H-naphtho[2,1-f]isoquinolin-1-ones. (C) 2003 Elsevier Ltd. All rights reserved.