Reaction of N-Vinylic Phosphazenes with ,-

详细信息    查看全文

• 作者：Francisco Palacios ; Esther Herr&aacute ; n ; Concepció ; n Alonso ; Gloria Rubiales ; Begoñ ; a Lecea ; Mirari Ayerbe ; Fernando P. Cossí ; o
• 刊名：Journal of Organic Chemistry
• 出版年：2006
• 出版时间：August 4, 2006
• 年：2006
• 卷：71
• 期：16
• 页码：6020 - 6030
• 全文大小：469K
• 年卷期：v.71,no.16(August 4, 2006)
• ISSN：1520-6904

文摘

MG SRC="/isubscribe/journals/joceah/71/i16/figures/jo060775bn00001.gif" ALIGN="left" HSPACE=5>

Aza-Wittig reaction of N-vinylic phosphazenes (1,2 addition), derived from diphenylmethylphosphine orderived from trimethylphosphine with mages/gifchars/alpha.gif" BORDER=0>,mages/gifchars/beta2.gif" BORDER=0 ALIGN="middle">-unsaturated aldehydes, leads to the formation of 3-azatrienesthrough a [2 + 2]-cycloaddition-cycloreversion sequence. The presence of an alkyl substituent in position3 of N-vinylic phosphazenes increases the steric interactions, and [4 + 2] periselectivity (1,4 addition)is observed. Reaction of azatrienes with mages/gifchars/alpha.gif" BORDER=0>,mages/gifchars/beta2.gif" BORDER=0 ALIGN="middle">-unsaturated aldehydes yields pyridines.