Dative Directing Group Effects in Ti-Catalyzed [2+2+1] Pyrrole Synthesis: Chemo- and Regioselective Alkyne Heterocoupling
作者:Hsin-Chun Chiu、Xin Yi See、Ian A. Tonks
DOI:10.1021/acscatal.8b04669
日期:2019.1.4
found to play a key role in controlling the regioselectivity of alkyne insertion and [2+2] cycloaddition in Ti-catalyzed [2+2+1] pyrrole synthesis and Ti-catalyzed alkyne hydroamination. TMS-protected alkynes with pendent Lewis basic groups can invert the regioselectivity of TMS-protected alkyne insertion, leading to the selective formation of highlysubstituted 3-TMS pyrroles. The competency of various
BUCKLE, D. R.;ROCKELL, C. J. M., J. CHEM. SOC. PERKIN TRANS., 1985, N 11, 2443-2446
作者:BUCKLE, D. R.、ROCKELL, C. J. M.
DOI:——
日期:——
AITKEN, R. ALAN;BURNS, GRAHAM, TETRAHEDRON LETT., 28,(1987) N 32, 3717-3718
作者:AITKEN, R. ALAN、BURNS, GRAHAM
DOI:——
日期:——
A versatile two-stage synthesis of 2-substituted benzo[b]furans from (2-methoxyphenyl)ethynes
作者:Derek R. Buckle、Caroline J. M. Rockell
DOI:10.1039/p19850002443
日期:——
(2-Methoxyphenyl)ethynes react with aryl or alkyl halides to give disubstituted alkynes which are converted into the corresponding 2-substitutedbenzo[b]furans on treatment with lithium iodide in 2,4,6-trimethylpyridine.
(2-甲氧基苯基)乙炔与芳基或烷基卤化物反应,得到二取代的炔,在碘化锂在2,4,6-三甲基吡啶中处理后,将其转化为相应的2-取代的苯并[ b ]呋喃。
A new synthesis of 2-substituted benzofurans and benzothiophens: Novel fragmentation reactions of simple alkyl groups
作者:R.Alan Aitken、Graham Burns
DOI:10.1016/s0040-4039(00)96366-4
日期:1987.1
Flashvacuumpyrolysis of (2-methoxy- and (2-methylthiobenzoyl)alkylidenetriphenylphosphoranes results in loss of Ph3PO and methyl radical; cyclisation of the resulting radical intermediates leads to benzofurans and benzothiophens in which the 2-substituents have undergone novel fragmentation processes.