Highly Diastereoselective Reformatsky-Type Reaction Promoted by Tin Iodide Ate Complex
摘要:
GRAPHICSAn ate type of tin complex, Li+[n-Bu2SnI3](-)/HMPA, works as a novel type of reagent to accomplish the highly diastereoselective Reformatsky-type reaction by the halogen-metal exchange method.
Treatment of diphenyltin, (Ph2Sn)m, with alkyl halide, RX, afforded Ph2RSnX, Ph3SnX, PhRSnX2, PhR2SnX and Ph2SnX2. The mode of formation of these compounds was studied.
Regio- and stereoselective hydrostannation of allenes using dibutyliodotin hydride (Bu2SnIH) and successive coupling with aromatic halides
作者:Naoki Hayashi、Kazunao Kusano、Shingo Sekizawa、Ikuya Shibata、Makoto Yasuda、Akio Baba
DOI:10.1039/b712998j
日期:——
Regio- and stereoselective hydrostannation of allenes by using di-n-butyliodotin hydride (Bu2SnIH) was accomplished to give α,β-disubstituted vinyltins, which induced the synthesis of multi-substituted alkenes in a one-pot procedure.
Hydroindation of allenes and its application to radical cyclization
作者:Naoki Hayashi、Yusuke Hirokawa、Ikuya Shibata、Makoto Yasuda、Akio Baba
DOI:10.1039/b803314e
日期:——
Hydroindation of allenes and radical cyclization of 1,2,7-trienes (allenenes) were accomplished by HInCl2 with high regioselectivity to afford a variety of cyclic compounds. The resulting vinylic indiums could be used for successive coupling reactions in a one-pot procedure. The use of HInCl2 generated slowly in situ is extremely effective for the radical cyclization.
In this study, the Bu2SnIH-catalyzed direct coupling of 1,3-dienes with aldehydes was developed. This reaction could be suitable for coupling without the use of transition-metal catalysts. Many types of aldehydes were applied to this reaction. The addition of MeOH promoted the catalytic cycle.
(Bu2SnIH). The resultant allylic tin compounds reacted easily with aldehydes. Furthermore, the use of Bu2SnIH was effectively catalytic in the presence of hydrosilane as a hydride source, which established a coupling reaction of VCPs with aldehydes for the synthesis of homoallylic alcohols without the use of transition‐metal catalysts. In contrast to conventional catalytic reactions of VCPs, the presented method