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. 2024 Feb 28;26(9):1828–1833. doi: 10.1021/acs.orglett.3c04366

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© 2024 The Authors. Published by American Chemical Society

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Cyclization of Nle-2 and Nle-2^3d by Blt-M1. (A) HRMS of the MS¹ isotope cluster is indicative of the loss of deuterium in Nle-5 from the cyclization of Nle-2^3d, thus supporting a C–C cross-link in this case. (B) MS² fragmentation of Nle-5 suggesting the formation of a HXY cross-link. For NMR of 5, see SI Figure S26.