TMSOTf-mediated approach to 1,3-oxazin-2-one skeleton through one-pot successive reduction-[4 + 2] cyclization process of imides with ynamides
作者:Chen-Chen Zhang、Zhi-Peng Huo、Mei-Lin Tang、Yong-Xi Liang、Xun Sun
DOI:10.1016/j.tetlet.2021.152946
日期:2021.3
A one-pot approach to access functionalized 1,3-oxazin-2-one skeleton has been developed through successive reduction and subsequent [4 + 2] cyclization process of N-Boc lactams with ynamides by TMSOTf. As a result, a number of five to seven membered ring fused bicyclic [1,2-c][1], [3]oxazin-1-ones 12a-m and tricyclic derivatives 13a-f were obtained in moderate to excellent yields with excellent regioselectivities
通过连续还原和随后通过TMSOTf还原N- Boc内酰胺和酰胺类化合物的[4 + 2]环化过程,已经开发出了一种通过一锅法获得功能化的1,3-恶嗪-2-酮骨架的方法。结果,以中等至极好的收率得到了许多五至七元环稠合的双环[1,2-c] [1],[3]恶嗪-1-酮12a-m和三环衍生物13a-f。极好的区域选择性。而且,直链N - Boc酰胺9a-e也适合于该转化,并且容易以中等产率以优异的区域选择性获得期望的3,4-二氢-1,3-恶嗪-2-酮14a-m。