A nitrene/alkyne cascade reaction terminating in C–H bond insertion to form functionalized bridged azacycles from carbonazidates is presented. Due to an initial Huisgen cyclization, all carbonazidates reacted with the alkyne in an exo mode in contrast to the use of sulfamate esters, which react predominately in an endo mode. Substrates with different ring sizes as well as different aryl and heteroaryl groups were also explored. Variation of the nitrene tether showed that 7-membered rings were the maximum ring size to be formed by nitrene attack on the alkyne. Examples incorporating stereocenters on the carbonazidate’s tether induced diasteroselectivity in the formation of the bridged ring and two new stereocenters. Additionally, propellanes containing aminals, hemiaminals, and thioaminals formed from the bridged azacycles in the same reaction via an acid-promoted rearrangement.

中文翻译：

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通过硝基/炔级联反应合成桥连氮杂环和丙烷。

提出了一种氮/炔级联反应，该反应终止于C–H键的插入，从而从碳叠氮化物形成官能化的桥连氮杂环。由于最初的Huisgen环化作用，与氨基磺酸酯的使用相比，氨基磺酸酯主要以内消旋的方式发生反应，因此所有碳叠氮化物均以exo方式与炔烃反应。还研究了具有不同环尺寸以及不同芳基和杂芳基的底物。氮烯系链的变化表明，七元环是氮炔对炔烃的攻击所形成的最大环尺寸。在碳氮酸盐的系链上结合立体中心的例子在桥接环和两个新的立体中心的形成中引起非对映选择性。此外，含有螺旋藻，半缩醛，