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. 2021 Sep 15;1(10):1527–1540. doi: 10.1021/jacsau.1c00308

Scheme 8. Synthesis of AviCys Derivatives via Condensation of Acetamide upon Acetal 43 in the Presence of a Mild Lewis Acid11.

Scheme 8

Inset: (left) transition state 43a and 43b occurring with sulfur-containing substrates; (right) illustration of hyperconjugation occurring with sulfur-containing substrates leading to the Z-isomer 44.