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
摘要:
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.
A novel bifunctionalchiral pyridoxal derivative 1 with a bigger catalytic cavity than that of previous pyridoxal catalysts promoted direct asymmetric α-C allylation of NH2-unprotected glycinates with Morita–Baylis–Hillmanacetates. In this way, the chemoselectivity for glycinates was switched from intrinsic N-allylation to α-C allylation to produce chiral glutamic acid esters with excellent stereoselectivity