Bisphosphine-Catalyzed Mixed Double-Michael Reactions: Asymmetric Synthesis of Oxazolidines, Thiazolidines, and Pyrrolidines
作者:Vardhineedi Sriramurthy、Gregg A. Barcan、Ohyun Kwon
DOI:10.1021/ja073754n
日期:2007.10.1
mixed double-Michael reactions have been developed to afford β-amino carbonyl derivatives of oxazolidines, thiozolidines, and pyrrolidines in excellent yields and with high diastereoselectivities. Efficient reactions between amino-acid-derived pronucleophiles, such as β-amino alcohols, β-amino thiols, and γ-amino diesters, as Michael donors and electron-deficient acetylenes, such as propiolates, acetylacetylene
已经开发出双膦催化的混合双迈克尔反应,以优异的收率和高非对映选择性提供恶唑烷、硫唑烷和吡咯烷的 β-氨基羰基衍生物。氨基酸衍生的亲核试剂(如 β-氨基醇、β-氨基硫醇和 γ-氨基二酯)作为迈克尔供体与缺电子乙炔(如丙炔酸酯、乙炔和甲苯磺酰乙炔作为迈克尔受体)之间的有效反应获得包含取代基多样性和不对称性的唑烷。这种方法是乙炔混合双迈克尔反应的第一个例子,操作简单,条件温和。从机制上讲,它构成了双膦在有机催化中的嵌合辅助的罕见例子。