Highly regioselective hydroiodination of terminal alkynes and silylalkynes with iodine and phosphorus reagents leading to internal iodoalkenes
摘要:
Markovnikov-type hydroiodination of terminal alkynes with iodine and Ph2P(O)H took place selectively to afford the corresponding internal iodoalkenes in good yields. Combination of (PhO)(2)P(O)H and Ph2P(O)OH instead of Ph2P(O)H also provided internal iodoalkenes in excellent yields. This hydroiodination is advantageous in terms of mild conditions, convenient operation, and tolerance to various functional groups. In addition, direct synthesis of internal iodoalkenes from silylalkynes was also achieved by using a mixed system of iodine and phosphorus reagents. (c) 2012 Elsevier Ltd. All rights reserved.
A new, simple procedure for the generation and addition of HI to alkenes and alkynes using Bl3:N,N-diethylaniline complex and acetic acid
作者:Ch. Kishan Reddy、M. Periasamy
DOI:10.1016/s0040-4039(00)98817-8
日期:1990.1
Hydroiodic acid generatedin situ from Bl3:N,N-diethylanilinecomplex and acetic acid, readily adds to alkenes and alkynes in Markovnikov fashion to form alkyl and alkenyl iodides in good yields under mild conditions.
Vinyl radicals, generated from the reaction of vinyl iodides with tributylstannyl radical, react with electron-deficient alkenes to give di- or trisubstitutedalkenes in moderate to good yields. The stereoselectivity is largely dependent on the substituent at 1- and 2-position of vinyl iodides.
R3SiMgMe and MnCl2 are disclosed. (1) The manganese species reacted with terminal acetylenes to give 1,2-disilylated 1-alkenes. Mono- and bis(trimethylsilyl) acetylenes gave tri- and tetrasilylated ethenes, respectively, in good yields. Highly strained tetrakis(trimethylsilyl) ethene has now become easily accessible by this technique. (2) The reaction of alkenyl halides, alkenyl sulfides, and enol phosphates
A convenient hydroiodination of alkynes using I2/PPh3/H2O and its application to the one-pot synthesis of trisubstituted alkenes via iodoalkenes using Pd-catalyzed cross-coupling reactions
作者:Shin-ichi Kawaguchi、Yuhei Gonda、Haruna Masuno、Huệ Thị Vũ、Kotaro Yamaguchi、Hiroyuki Shinohara、Motohiro Sonoda、Akiya Ogawa
DOI:10.1016/j.tetlet.2014.10.039
日期:2014.12
A facile hydroiodination of alkynes using readily-available reagents such as I2, PPh3, and H2O has been developed. This is extended to the one-pot synthesis of trisubstituted alkenes from alkynes via iodoalkenes using Pd-catalyzed cross-coupling and related methods such as the Suzuki–Miyaura cross-coupling, Sonogashira cross-coupling reaction, and Mizoroki–Heck reaction.
The reaction of alkenyl halides, alkenyl sulfides, and enol phosphates with (R3Si)3MnMgMe provides vinylsilanes in good yields. The method is also applicable to the allylsilanesynthesis from allylic sulfides and ethers.