Stereoselective Synthesis of Methyl (Z)-3-Iodo-2-(1-hydroxyalkyl)prop-2-enoates and Their Further Transformation to α-(Z)-Iodomethylene-β-lactones
作者:Chunming Zhang、Xiyan Lu
DOI:10.1055/s-1996-4266
日期:1996.5
The tandem nucleophilic addition-aldol reaction of methyl propynoate, iodide ion, and aldehydes or ketones in the presence of ZrCl4 as the catalyst gave methyl 3-iodo-2-(1-hydroxyalkyl)prop-2-enoates with high Z selectivity, which were further transformed to α-(Z)-iodomethylene-β-lactones in good yield.
Aldol reaction of allenolates generated via 1,4-addition of iodide anion or its equivalent to α,β-acetylenic ketones
作者:Mikio Taniguchi、Tohru Hino、Yoshito Kishi
DOI:10.1016/s0040-4039(00)85060-1
日期:——
TMSI, Et2AlI and (n-Bu)4NI/TiCl4 smoothly added to α,β-acetylenicketones in a 1,4-fashion to yield allenolates , which reacted with aldehydes providing aldol adducts in good overall yield. A high Z-stereoselectivity was achieved by use of (n-Bu)4NI/TiCl4 at −78°C, while a high E-stereoselectivity occurred at 0°C.
将TMSI,Et 2 AlI和(n-Bu)4 NI / TiCl 4平稳地以1,4-方式添加到α,β-炔酮中以生成烯丙基酯,该烯丙基酯与醛反应生成醛醇加合物,总收率良好。通过在-78°C下使用(n-Bu)4 NI / TiCl 4可以实现高Z-立体选择性,而在0°C时则可以实现高E-立体选择性。
The Aldol Reaction of Allenolates with Aldehydes in the Presence of Magnesium Diiodide (MgI2) as Catalyst
作者:Guang-Hui Deng、Hui Hu、Han-Xun Wei、Paul W. Paré
DOI:10.1002/hlca.200390294
日期:2003.10
Stereoselective synthesis of (Z)-α-(hydroxyalkyl)-β-iodoacrylates (=(2Z)-2-(hydroxyalkyl)-3-iodoprop-2-enoates) was achieved in a one-pot coupling reaction from methyl prop-2-ynoate, Me3SiI, and an alkanal under mild conditions with MgI2 as catalyst ( 1–9; see Table and Scheme 1). Baylis-Hillmanβ-iodo adducts were generated in excellent yields with high (Z)-selectivity. The conversion of methyl prop-2-ynoate
Synthesis of β-iodo-α-(hydroxyalkyl)acrylates: a convenient and stereoselective reaction
作者:Han-Xun Wei、Guigen Li、Joe J. Gao、Paul W. Paré
DOI:10.1016/s0040-4039(02)01106-1
日期:2002.8
An efficient one-pot, three-component coupling reaction for the synthesis of beta-iodo-alpha-(hydroxyalkyl)acrylates has been developed. As the iodine source as well as the Lewis acid mediator, diethyl aluminium iodide undergoes a Michael-type addition with methyl propynoate to form an active beta-iodo allenolate intermediate, which in turn attacks various aldehydes or ketones to afford beta-iodo Baylis-Hillman adducts in excellent yields with high Z-selectivity. (C) 2002 Elsevier Science Ltd. All rights reserved.
TANIGUCHI MIKIO; HINO TOHRU; KISHI YOSHITO, TETRAHEDRON LETT., 27,(1986) N 39, 4767-4770