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. Author manuscript; available in PMC: 2019 Jul 20.
Published in final edited form as: J Org Chem. 2017 Dec 6;83(14):7500–7503. doi: 10.1021/acs.joc.7b02329

Scheme 1.

Scheme 1.

Scalability of published syntheses of s-TCO (1) and BCN (2) are limited by poor diastereoselectivity of the initial cyclopropanation reaction involving 1,5-COD and ethyl diazoacetate