作者:Nicole Langlois、Bao K. Le Nguyen
DOI:10.1021/jo040216+
日期:2004.10.1
(+/-)-Deoxydysibetaine 2 and 4-epi-dysibetaine 3 were prepared in a few steps from methyl pyroglutamate through a regioselective Mannich reaction at C-2. Natural (2S,4S)-dysibetaine 1, a sponge metabolite isolated from Dysidea herbacea, and (2S)-2 were synthesized from enantiopure (S)-pyroglutaminol with very high stereoselectivity. The key steps were an original formation of stereogenic quaternary center C-2 and the diastereoselective hydroxylation at C-4.
(±)-Deoxydysibetaine 2 和 4-epi-dysibetaine 3 是通过从甲基吡咯谷氨酸出发,经由 C-2 位的区域选择性曼尼希反应,在少量步骤中制备得到的。天然 (2S,4S)-dysibetaine 1 是从 Dysidea herbacea 海绵中分离得到的一种代谢物,而 (2S)-2 则是通过从光学纯的 (S)-吡咯谷氨醇出发,以非常高的立体选择性合成得到的。关键步骤包括一个生成C-2立体感应季碳中心的原始反应,以及C-4位的双相选择性羟基化反应。