An efficient approach to access functionalized dihydro-[1,3]oxazino[4,3-a] isoindole and tetrahydroisoquinoline skeletons has been developed through the addition-cyclization process of ynamides 8 with N-acyliminium ions generated from N,O-acetals 6,7. The reactions were conducted under the catalysis of Cu(OTf)₂, and a number of functionalized dihydro-[1,3]oxazino[4,3-a] isoindoles 9a-9y and tetrahydroisoquinolines 10a-10g, 11a-11p were generated in 48–98% yields. When chiral ynamides 8n-8u were used, optically pure products 11a-11p could be obtained with good to excellent yields and diastereoselectivities.

中文翻译：

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Cu（OTf）₂催化N-酰基亚胺离子与酰胺的反应合成二氢-[1,3]恶嗪基[4,3-a]异吲哚和四氢异喹啉

通过使用由N，O-缩醛6生成的N-酰亚胺离子对酰胺8进行加成环化工艺，已经开发出一种有效的方法来访问官能化的二氢-[1,3]恶嗪[4,3-a]异吲哚和四氢异喹啉骨架。，7。反应在Cu（OTf）₂的催化下进行，并在其中生成了许多官能化的二氢-[1,3]恶嗪基[4,3-a]异吲哚9a-9y和四氢异喹啉10a-10g，11a-11p。 48–98％的产量。当使用手性乙酰胺8n-8u时，可以获得具有良好或优异的产率和非对映选择性的光学纯产物11a-11p。