Cobalt-Catalyzed Ortho-C(sp2)-H Amidation of Benzaldehydes with Dioxazolones Using Transient Directing Groups.
Jie HuangJun DingTong-Mei DingShuiyi ZhangYaqiu WangFeng ShaShu-Yu ZhangXin-Yan WuQiong LiPublished in: Organic letters (2019)
An efficient and convenient cobalt-catalyzed ortho-C(sp2)-H amidation of benzaldehydes employing dioxazolones as the aminating reagent has been developed. The key feature of this protocol is the use of green and economic earth-abundant metals cobalt as the catalyst with the p-chloroaniline as the transient directing group. Further application of our approach was demonstrated by the synthesis of C1r serine protease inhibitor 45 and elastase inhibitor 49.
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