Synthesis of taxanes—the carvone approach; a simple, efficient stereo- and enantio-selective synthesis of the functionalised A ring
摘要:
A highly stereo- and enantio-selective methodology for the construction of the chiral functionalised A-ring of taxanes, starting from (R)-carvone employing a short, simple and efficient sequence is described.
Formal Aminocyanation of α,β-Unsaturated Cyclic Enones for the Efficient Synthesis of α-Amino Ketones
作者:Chunrui Sun、Matthew J. O'Connor、Daesung Lee、Donald J. Wink、Robert D. Milligan
DOI:10.1002/anie.201309435
日期:2014.3.17
occurs through the formation of pyrazolines by means of a formal dipolar cycloaddition of cyclic α,β‐unsaturated ketones with lithium trimethylsilyldiazomethane followed by novel protonolytic NN bond cleavage under mild conditions. This two‐step process provides a diverse array of structurally complex free and mono‐alkylated α‐amino ketones in excellent yields.