Preparation of novel β,β-diphenyl α-(trifluoromethyl)vinylstannane and its cross-coupling reactions with aryl iodides
作者:In Howa Jeong、Young Sam Park、Bum Tae Kim
DOI:10.1016/s0040-4039(00)01606-3
日期:2000.11
β,β-Diphenyl-α-(trifluoromethyl)vinylstannane 6 was prepared in good yield via several steps from 2,3,3,3-tetrafluoro-1-phenyl-1-phenylthiopropene. The cross-coupling reactions of 6 with aryl iodides in the presence of a catalytic amount of Pd(PPh3)4 and CuI provided trifluoromethylated triphenylethene derivatives 7 in high yields.
Synthesis of novel 2-trifluoromethyl-1-methylene-3-phenylindene derivatives via carbocyclization reaction of 2-trifluoromethyl-1,1-diphenyl-1,3-enynes
作者:Ji Hye Hwang、Yeon Hui Jung、Youn Young Hong、Sung Lan Jeon、In Howa Jeong
DOI:10.1016/j.jfluchem.2011.06.031
日期:2011.12
Trifluoromethylated enynyl sulfones 3 were reacted with PhLi at -78 degrees C for 2-4 h to give 2-trifluoromethyl-1,1-diphenyl-1,3-enynes 6 in good yields. Carbocyclization reaction of 6 with 10 mol% of Pd(OAc)(2) in cosolvent of CF3COOH and MC (4:1) at room temperature for 1 h afforded 2-trifluoromethyl-1-methylene-3-phenylindene derivatives 7 in good yields. (C) 2011 Published by Elsevier B.V.
A novel method for (Z)-stereoselective preparation of CF3-substituted enediynes and their coupling reactions
作者:Hyang Hwa Jeon、Jang Bae Son、Ji Hoon Choi、In Howa Jeong
DOI:10.1016/j.tetlet.2006.11.111
日期:2007.1
Trifluoromethylated enynyl sulfones 3 were reacted with 2-4 equiv of phenyl, n-hexyl, trimethylsilyl, or triisopropylsilyl substituted ethynyllithium reagents in THF or ether at 0 degrees C to give trifluoromethylated enediynes 6 (Z)-stereoselectively in 41-96% yields. The reactions of beta-fluoro-beta-trifluoromethylvinyl sulfone 5 with same ethynyllithium reagents (4 equiv) afforded the corresponding enediynes 6 in 41-90% yields. The cross-coupling reactions of 6 bearing TMS group with aryl iodides in the presence of Pd(PPh3)(2)Cl-2, Ag2CO3, and n-BU4NBr provided the corresponding enediynes 6 in 20-71% yields. Dimerization of (Z)-6 bearing TMS group in the presence of CuBr2 and K2CO3 yielded dimer (Z,Z)-7 in good yield. (c) 2006 Elsevier Ltd. All rights reserved.