Phosphinic Dehydrodipeptides: Diversification of the P1′ Residue with the Morita–Baylis–Hillman Acetates and Inhibition of Alanyl Aminopeptidases
作者:Michał Talma
DOI:10.1007/s10989-019-10004-7
日期:2020.12
Activated allylacetates (the Morita–Baylis–Hillman acetates) were confirmed as convenient electrophilic precursors of the P1′ fragment of phosphinic dehydrodipeptides, and then, their selected saturated analogs were obtained in the subsequent reduction. This approach is particularly appropriate for structurally complex side chains and thus is an alternative to the addition of α-substituted acrylates
The Baylis–Hillman chemistry in aqueous media: elucidation of mechanism for synthesis of ether side-product leads to an efficient approach to C–O bond formation
The formation of an ether from the Baylis-Hillman (BH) adduct during the BH reaction of 5-isoxazolecarboxaldehydes is a common phenomenon if the reaction is allowed to proceed for longer periods. The amount of formation of such ethers depends on the acrylates used and is most significant for tert-butyl acrylates. A study of the plausible mechanism for the formation of these side-products led to reactions of acetates of BH adducts with phenol in aqueous media to yield the corresponding 3-phenoxy alk-2-enoates in good yields. The successful translation of solution phase methodology to solid phase for application towards combinatorial chemistry is discussed. (C) 2003 Elsevier Science Ltd. All rights reserved.