Synthesis of 1H-isochromen-1-ylphosphonates via AgOTf-catalyzed reaction of 2-alkynylbenzaldehyde with diethyl phosphite
作者:Xingxin Yu、Qiuping Ding、Weizi Wang、Jie Wu
DOI:10.1016/j.tetlet.2008.05.009
日期:2008.7
Tandem cyclization-addition reaction of 2-alkynylbenzaldehyde with diethyl phosphite catalyzed by AgOTf at room temperature was developed, which afforded the desired 1H-isochromen-1-ylphosphonates in moderate to good yields. (C) 2008 Elsevier Ltd. All rights reserved.
Efficient syntheses of phosphonylated isochromenes by regioselective 6-endo-dig addition to carbon-carbon triple bond catalyzed by Pd(OAc)2
作者:Fei Wang、Zhiwei Miao、Ruyu Chen
DOI:10.1039/b908313h
日期:——
Palladium(II)-catalyzed cycloisomerization of [(2-alkynylphenyl)hydroxymethyl]phosphonates 6 provides an efficient route to phosphonylated isochromenes 7 in THF at room temperature and the reaction proceeded in a regioselective manner leading to the 6-endo-dig products 7 in moderate to excellent yields.