SmI2-Mediated coupling reactions between iodoalkynes and ketones or aldehydes to give propargyl alcohols
作者:Munetaka Kunishima、Shinobu Tanaka、Kazuhiro Kono、Kazuhito Hioki、Shohei Tani
DOI:10.1016/0040-4039(95)00659-z
日期:1995.5
Samarium iodide (SmI2) mediates a coupling reaction between alkynyl iodides and ketones or aldehydes to give propargyl alcohols in the presence of hexamethylphosphoric triamide (HMPA) in either benzene or tetrahydrofuran (THF). An alkynylsamarium is involved as an intermediate.
A cobalt complex, [CoCl2(dpph)] (DPPH = [1,6-bis(diphenylphosphino)hexane]), catalyzes an intermolecular styrylation reaction of alkyl halides in the presence of Me3SiCH2MgCl in ether to yield beta-alkylstyrenes. A variety of alkyl halides including alkyl chlorides can participate in the styrylation. A radical mechanism is strongly suggested for the styrylation reaction. The sequential isomerization/styrylation
and operationally‐simple process for the synthesis of 1‐iodoalk‐1‐ynes under mild conditions catalyzed by CuI/TBAB in waterunderair was developed in this study. Catalyst loadings of CuI as low as 1–2 mol% gave 1‐iodoalk‐1‐ynes in good to high yields, and the residual aqueous solution after extraction with hexane could be reused for the next reaction without any treatment.
Chemoselective and stereospecific iodination of alkynes using sulfonium iodate(<scp>i</scp>) salt
作者:Dodla S. Rao、Thurpu R. Reddy、Sudhir Kashyap
DOI:10.1039/c7ob03076b
日期:——
An efficient and highly chemoselective iodination of alkynes using a sulfoniumiodate(I) electrophilc reagent under metal-free conditions has been realized. The reactivity of sulfoniumiodate(I) salt could be significantly diverse in the presence of water as the solvent, enabling the (E)-1,2-diiodoalkenes stereospecifically. This stereodivergent approach is amenable to a wide range of alkyne substrates
A Simple Convenient Method for the Synthesis of 1-Iodoalkynes
作者:M. Lakshmi Narayana Rao、Mariappan Periasamy
DOI:10.1080/00397919508011785
日期:1995.8
Abstract Reaction of terminal alkynes with ethylmagneslum bromide In THF followed by the addition of lodine In THF gives 1-lodoalkynes In excellent yields (90–96%).