CONSTRUCTION OF POLYCYCLIC COMPOUNDS BY CYCLOCARBONYLATION .6. PALLADIUM-CATALYZED CYCLOCARBONYLATION OF 3-(HETEROARYL)ALLYL ACETATES

被引:60
作者
IWASAKI, M [1 ]
KOBAYASHI, Y [1 ]
LI, JP [1 ]
MATSUZAKA, H [1 ]
ISHII, Y [1 ]
HIDAI, M [1 ]
机构
[1] UNIV TOKYO,FAC ENGN,DEPT SYNTHET CHEM,BUNKYO KU,TOKYO 113,JAPAN
关键词
D O I
10.1021/jo00005a046
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Acetoxybenzofurans, acetoxybenzothiophenes, acetoxyindoles, and acetoxycarbazoles were obtained in high yields by cyclocarbonylation of 3-furyl-, 3-thienyl-, 3-pyrrolyl-, and 3-indolylallyl acetates, respectively, in the presence of Ac2O, NEt3, and a catalytic amount of PdCl2(PPh3)2 at 130-170-degrees-C under 50-70 atm of CO. 3-(3-Furyl)allyl and 3-(3-thienyl)allyl acetates cyclized selectively at the 2-position of the heterocyclic nucleus to give 7-acetoxybenzofuran and 7-acetoxybenzothiophene, respectively. The synthetic utility of the reaction was demonstrated by the synthesis of cannabifuran from isothymol.
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页码:1922 / 1927
页数:6
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