在手性BINOL-Ti(O i Pr)4配合物的催化下,各种稳定的叔酰胺与水杨醛反应,得到各种顺式,反式构型的4-苯并三酚,其中三个连续的立体构型中心,收率高,具有非对映选择性和对映选择性。该反应通过向烯醛中添加烯酰胺,然后通过羟基分子内截留所生成的亚胺来进行。氧化所得的4-色醇,得到几乎定量的苯并四氢吡喃-4-酮衍生物,用NaBH 4进行非对映特异性还原,生成顺式,顺式构型的4-色醇。
Exploring tertiary enamides as versatile synthons in organic synthesis
作者:Mei-Xiang Wang
DOI:10.1039/c4cc10327k
日期:——
Tertiary enamides have long been thought of as stable and marginally valuable enamine variants in synthesis. This notion has been challenged, however, in recent years. Enabling the regulation of the cross-conjugation system of the tertiary enamides has been successfully shown to enhance delocalization of the nitrogen lone-pair electrons into a carbon-carbon double, thereby reinvigorating the enaminic
Catalytic Asymmetric Difunctionalization of Stable Tertiary Enamides with Salicylaldehydes: Highly Efficient, Enantioselective, and Diastereoselective Synthesis of Diverse 4-Chromanol Derivatives
作者:Ling He、Liang Zhao、De-Xian Wang、Mei-Xiang Wang
DOI:10.1021/ol5029964
日期:2014.11.21
BINOL–Ti(OiPr)4 complex, various stable tertiaryenamides reacted with salicylaldehydes to afford diverse cis,trans-configured 4-chromanols that contain three continuous stereogenic centers in good yields with excellent diastereoselectivity and enantioselectivity. The reaction proceeded through the addition of enamide to aldehyde followed by the intramolecular interception of the resulting iminium by
在手性BINOL-Ti(O i Pr)4配合物的催化下,各种稳定的叔酰胺与水杨醛反应,得到各种顺式,反式构型的4-苯并三酚,其中三个连续的立体构型中心,收率高,具有非对映选择性和对映选择性。该反应通过向烯醛中添加烯酰胺,然后通过羟基分子内截留所生成的亚胺来进行。氧化所得的4-色醇,得到几乎定量的苯并四氢吡喃-4-酮衍生物,用NaBH 4进行非对映特异性还原,生成顺式,顺式构型的4-色醇。