Palladium-catalyzed dicyanative [4 + 2] cycloaddition using various ene−enynes was investigated. The key species in this process is a cyanoallene intermediate that is obtained by the cyanopalladation of conjugated enynes followed by 5-exo-cyclization. To achieve an efficient [4 + 2] cycloaddition reaction, both the smooth generation of this species and critical control of regioselectivity in the 6-endo-cyclization
Rhodium-Catalyzed Tandem Cyclopropanation/Cope Rearrangement of 4-Alkenyl-1-sulfonyl-1,2,3-triazoles with Dienes
作者:Brendan T. Parr、Huw M. L. Davies
DOI:10.1002/anie.201304310
日期:2013.9.16
Take your pick…︁ A practical method for the synthesis of structurally diverse rhodium vinylcarbenes from stable 1‐sulfonyl‐1,2,3‐triazole precursors has been developed. The reaction is general for a broad range of 4‐alkenyl triazoles and dienes, enabling the stereoselective synthesis of a variety of polycyclic imines, which are readily converted into amines or aldehydes in a one‐pot process.
Conversion of Cyclic Ketones to 2,3-Fused Pyrroles and Substituted Indoles
作者:Joshua S. Alford、Jillian E. Spangler、Huw M. L. Davies
DOI:10.1021/ja405043g
日期:2013.8.14
A highly effective synthesis of 2,3-fused pyrroles from cyclicketones has been achieved. The transformation includes a rhodium-catalyzed reaction of 4-alkenyl-1-sulfonyl-1,2,3-triazoles featuring an unusual 4π electrocyclization. The methodology was further extended to the synthesis of indoles using a one-pot reaction starting from 1-ethynylcyclohexenes.
Isomerization of Propargylic Alcohols into α,β-Unsaturated Carbonyl Compounds Catalyzed by the Sixteen-Electron Allyl-Ruthenium(II) Complex [Ru(η3-2-C3H4Me)(CO)(dppf)][SbF6]
作者:Victorio Cadierno、Sergio E. García-Garrido、José Gimeno
DOI:10.1002/adsc.200505294
日期:2006.1
(η3-allyl)-ruthenium(II) complex [Ru(η3-2-C3H4Me)(CO)(dppf)][SbF6] is an efficient catalyst for the regioselective isomerization of terminal propargylic alcohols HCCCR1R2(OH) into α,β-unsaturatedaldehydes R1R2CCHCHO or ketones R3R4CC(R1)COMe (if R2=CHR3R4) under mild conditions. This complex has been also used as catalyst for the preparation of conjugated 1,3-enynes via dehydration of propargylic alcohols
16-E -(η 3 -烯丙基) -钌(II)配合物的[Ru(η 3 -2-C 3 H ^ 4 ME)(CO)(DPPF)] [的SbF 6 ]是用于区域选择性异构化的有效催化剂在温和条件下将末端炔丙醇HCCCR 1 R 2(OH)转变为α,β-不饱和醛R 1 R 2 CCHCHO或酮R 3 R 4 CC(R 1)COMe(如果R 2 = CHR 3 R 4)。这种复杂的也已用作催化剂用于制备缀合的1,3-烯炔的经由 炔丙醇的脱水。
Die verwendung von diisobutylaluminiumhydrid zur stereoselektiven synthese von tertiären (e)-2-alkenylaminen, (e)-2-alken-4-inylaminen und 2(
作者:Anton Stütz、Waltraud Granitzer、Sabine Roth
DOI:10.1016/s0040-4020(01)91373-0
日期:1985.1
In exploring versatile synthetic routes to (E)-allylamine derivatives with antimycotic properties, a new method has been found in the trans-reduction of tertiary 2-alkinylanunes by diisobutylaluminum hydride (DIBAH). The stereoselectivity of this reaction, which is in contrast to the well-known cis-hydroalumination of disubstituted alkynes, and the regioselectivity have been studied in detail. Tertiary