In the Still-Wittig rearrangement, stannylated methyl (E)-allylic ethers having an aliphatic side chain (1a-c) exhibited the usual similar stereoselectivity, although the poor stereoselectivity was remarkably improved by the assistance of an alkoxy moiety on the alkenyl chain. A stannylated methyl (Z)-allylic ether bearing an alkoxy moiety on the alkenyl chain (1e) also showed a high E selectivity
Diastereoselectivity in the [2,3]-sigmatropic rearrangement of substituted allylic N,N-dialkylamidosulfoxylates. X-ray molecular structure of [(1′) S*, (S)S*]-(2′E)-4-[[3′-(4″-bromophenyl)-1′-methyl-2′-propenyl]sulfinyl]-morpholine
作者:Jean-Bernard Baudin、Itka Bkouche-Waksman、Georges Hareau、Sylvestre A. Julia、Robert Lorne、Claudine Pascard
DOI:10.1016/s0040-4020(01)82318-8
日期:1991.8
By the reaction with three N,N-dialkylamidosulfenyl chlorides 2 bearing representative sizes for the R groups on the nitrogen atom, several substituted secondary E or Z allylic alcohols (1a-h) have been converted into the corresponding pairs of diastereoisomeric allylic sulfinamides (3+-3′a-v), whose ratios have been determined by 1H NMR spectroscopy. Five cases of entirely diastereoselective [2,3]-sigmatropic
通过与三个N,N-二烷基酰胺基亚磺酰氯2(在氮原子上具有代表性的R基团)反应,一些取代的仲E或Z烯丙基醇(1a-h)已转化为相应的非对映异构烯丙基亚磺酰胺(3 + -3'av),其比例已通过1 H NMR光谱测定。已经观察到五例完全非对映选择性[2,3]-σ重排的情况。
The lithiation and alkylation of 4-(2′-alkenesulphinyl)-morpholines, a simple route to substituted allylic sulphinamides
作者:Jean-Bernard Baudin、Sylvestre A. Julia
DOI:10.1016/s0040-4039(00)99625-4
日期:1989.1
By the reaction with 4-morpholinesulphenyl chloride carried out in the presence of triethylamine, several substituted allylic alcohols have been converted into the corresponding allylic sulphinamides . As a complementary method, the new lithio-derivatives II have been prepared and efficiently alkylated with organic halides.
Secondary alcohols were converted into the corresponding ketones by methyl acrylate and rhodium catalyst efficiently undermicrowaveirradiation. Treatment of primary alcohols with the same condition resulted in the recovery of the starting materials. Primary alcohols were converted into aldehydes by hydrogen transfer reaction using methyl vinyl ketone and ruthenium catalyst undermicrowave irradiation
Low-Valent Titanium-Mediated Stereoselective Alkylation of Allylic Alcohols
作者:Ivan L. Lysenko、Keunho Kim、Hyung Goo Lee、Jin Kun Cha
DOI:10.1021/ja806440m
日期:2008.11.26
reactions of acyclic and cyclic allylic alcohols for the stereoselective introduction of ethyl, 2-silylethyl, 2-phenethyl, and alkenyl groups. Cross-coupling of an allylic alcohol with a vinylsilane or styrene derivative is particularly noteworthy, as an efficient cross-selective coupling of two alkenes has been elusive. The stereochemistry of the cross-coupling alkylation is consistent with syn addit