Direct synthesis of phenanthrenyl triflates from 1-biphenylyl-2-diazo-2-aryl ketones and triflic anhydride
作者:Yueqiang Liu、Sheng Zhang、Xiujuan Feng、Xiaoqiang Yu、Yoshinori Yamamoto、Ming Bao
DOI:10.1039/d3ob02005c
日期:——
A strategy for directsynthesis of phenanthrenyl triflates from 1-biphenylyl-2-diazo-2-aryl ketones and triflic anhydride is described. The reaction of 1-biphenylyl-2-diazo-2-aryl ketones with triflic anhydride proceeded smoothly in the presence of 2,6-di-tert-butylpyridine under mild conditions to produce phenanthrenyl triflates in high to excellent yields. The phenanthrenyl triflate products were
Facile Preparation of 3,4-Benzocoumarins from 2-Arylbenzoic Acids with NCS and Nai
作者:Hideo Togo、Momoko Nakamura
DOI:10.3987/com-20-14292
日期:——
Treatment of 2-arylbenzoic acids with N-chlorosuccinimide (NCS) and NaI at 70 degrees C under fluorescent lighting condition gave the corresponding 3,4-benzocoumarins in good yields under transition-metal-free condition. It was found that the reactivity of NCS with NaI for the formation of 3,4-benzocoumarins from 2-arylbenzoic acids was as high as that with NIS. Thus, the formation of carboxyl radicals and their cyclization onto an aromatic ring from 2-arylbenzoic acids with much less expensive NCS and NaI, than NIS could be successfully carried out to form 3,4-benzocoumarins.
HALTON B.; MILSOM P. J.; WOOLHOUSE A. D., J. CHEM. SOC. PERKIN TRANS., 1977,
作者:HALTON B.、 MILSOM P. J.、 WOOLHOUSE A. D.
DOI:——
日期:——
HUEGEL H. M.; KALLY D. P.; BROWNE A. R.; HALTON B.; MILSOM P. J.; WOOLHOU+, J. CHEM. SOC. PERKIN TRANS., PART 1 <JCPK-BH>, 1977, NO 21, 2340-2342
作者:HUEGEL H. M.、 KALLY D. P.、 BROWNE A. R.、 HALTON B.、 MILSOM P. J.、 WOOLHOU+