X-氮杂双环[ m .2.1]烷烃的立体选择性构建,其是通过[3 + 2]-环加成的非稳定的环状偶氮甲啶进行的:对映体受约束的氨基酸的合成和旋光的依巴替丁的正式全合成
摘要:
X-氮杂双环[ m .2.1]烷烃的立体选择性结构的一种新的通用策略是通过将环偶氮甲酰亚胺的[3 + 2]-环加成与合适的非手性偶极亲和剂开发出来的。环状的偶氮甲亚胺基团,整个内立德共轭都在环中,是通过利用Ag(I)F作为一个基团对N-烷基-α,α'-双(三甲基甲硅烷基)环状胺进行连续的双甲硅烷基化反应而生成的电子氧化剂。环状偶氮甲亚胺基化物的结构刚度允许其被双极亲和性分子优先区分出面部,从而导致非常好的外切/内切选择性。在外型/内通过与Oppolzer的丙烯酰基双极性亲和剂进行环加成反应,可以进一步开发与这些环加成反应相关的选择性,从而获得光学纯的X-氮杂双环[ m .2.1]烷烃。该方法的应用通过构建与氮杂双环结构框架有关的受约束氨基酸以及旋光表艾替巴定的正式全合成来证明。
X-氮杂双环[ m .2.1]烷烃的立体选择性构建,其是通过[3 + 2]-环加成的非稳定的环状偶氮甲啶进行的:对映体受约束的氨基酸的合成和旋光的依巴替丁的正式全合成
摘要:
X-氮杂双环[ m .2.1]烷烃的立体选择性结构的一种新的通用策略是通过将环偶氮甲酰亚胺的[3 + 2]-环加成与合适的非手性偶极亲和剂开发出来的。环状的偶氮甲亚胺基团,整个内立德共轭都在环中,是通过利用Ag(I)F作为一个基团对N-烷基-α,α'-双(三甲基甲硅烷基)环状胺进行连续的双甲硅烷基化反应而生成的电子氧化剂。环状偶氮甲亚胺基化物的结构刚度允许其被双极亲和性分子优先区分出面部,从而导致非常好的外切/内切选择性。在外型/内通过与Oppolzer的丙烯酰基双极性亲和剂进行环加成反应,可以进一步开发与这些环加成反应相关的选择性,从而获得光学纯的X-氮杂双环[ m .2.1]烷烃。该方法的应用通过构建与氮杂双环结构框架有关的受约束氨基酸以及旋光表艾替巴定的正式全合成来证明。
[3 + 2] Cycloaddition of Nonstabilized Azomethine Ylides. 7. Stereoselective Synthesis of Epibatidine and Analogues<sup>,</sup>
作者:Ganesh Pandey、Trusar D. Bagul、Akhil K. Sahoo
DOI:10.1021/jo971728+
日期:1998.2.1
Epibatidine (1) is synthesized by employing a [3 + 2] cycloaddition strategy as a key step via nonstabilized azomethineylide 10, generated by one-electron oxidative double desilylation of N-benzyl-2,5-bis(trimethylsilyl)pyrrolidine (12). Cycloaddition of 10 with trans-ethyl-3-(6-chloro-3-pyridyl)-2-propenoate (22a) gives 26 in which the 6-chloro-3-pyridyl moiety is endo-oriented. Decarboxylation followed
[3+2]-Cycloaddition of nonstabilized azomethine ylides, part 9: A general approach for the construction of X-azabicyclo[m.2.1]alkanes in optically pure form by asymmetric 1,3-dipolar cycloaddition reactions
作者:Ganesh Pandey、Joydev K. Laha、A.K. Mohanakrishnan
DOI:10.1016/s0040-4039(99)01258-7
日期:1999.8
A general strategy for the construction of X-azabicyclo[m.2.1]alkane frameworks in optically pure form is reported by the asymmetric [3+2]-cycloaddition reaction of cyclic azomethineylides with Oppolzer's acryloyl camphor sultam.
Efficient generation and [3+2] cycloaddition of cyclic azomethine ylides: A general synthetic route to x-azabicyclo (m.2.1) alkane framework
作者:Ganesh Pandey、G. Lakshmaiah、Anjan Ghatak
DOI:10.1016/s0040-4039(00)79314-2
日期:1993.11
An efficient method of cyclic azomethine ylide generation and their application in synthesizing x-azabicyclo (m.2.1) alkanes has been described.
Stereoselective construction of X-azabicyclo[m.2.1]alkanes by [3+2]-cycloaddition of non-stabilized cyclic azomethine ylides: synthesis of enantiopure constrained amino acids and formal total synthesis of optically active epibatidine
作者:Ganesh Pandey、Joydev K Laha、G Lakshmaiah
DOI:10.1016/s0040-4020(02)00322-8
日期:2002.4
cycloadditions has been further exploited to access optically pure X-azabicyclo[m.2.1]alkanes by carrying out the cycloadditions with the Oppolzer's acryloyl dipolarophile. Application of this methodology is demonstrated by the construction of few constrained amino acids related to azabicyclic structural framework and the formal totalsynthesis of opticallyactive epibatidine.
X-氮杂双环[ m .2.1]烷烃的立体选择性结构的一种新的通用策略是通过将环偶氮甲酰亚胺的[3 + 2]-环加成与合适的非手性偶极亲和剂开发出来的。环状的偶氮甲亚胺基团,整个内立德共轭都在环中,是通过利用Ag(I)F作为一个基团对N-烷基-α,α'-双(三甲基甲硅烷基)环状胺进行连续的双甲硅烷基化反应而生成的电子氧化剂。环状偶氮甲亚胺基化物的结构刚度允许其被双极亲和性分子优先区分出面部,从而导致非常好的外切/内切选择性。在外型/内通过与Oppolzer的丙烯酰基双极性亲和剂进行环加成反应,可以进一步开发与这些环加成反应相关的选择性,从而获得光学纯的X-氮杂双环[ m .2.1]烷烃。该方法的应用通过构建与氮杂双环结构框架有关的受约束氨基酸以及旋光表艾替巴定的正式全合成来证明。