作者:Alexander Seitz、Raffael C. Wende、Emily Roesner、Dominik Niedek、Christopher Topp、Avene C. Colgan、Eoghan M. McGarrigle、Peter R. Schreiner
DOI:10.1021/acs.joc.0c02772
日期:2021.3.5
monosaccharides. We identified catalysts that invert site-selectivity compared to N-methylimidazole, which was used to determine the intrinsic reactivity, for 4,6-O-protected glucopyranosides (trans-diols) as well as 4,6-O-protected mannopyranosides (cis-diols). The reaction yields up to 81% of the inherently unfavored 2-O-acetylated products with selectivities up to 15:1 using mild reaction conditions. We also
在此,我们报道了部分保护的单糖的寡肽催化的位点选择性酰化。我们确定了催化剂,其反转的网站选择性相比ñ甲基咪唑,这是用来确定内在反应,为4,6- Ø重保护的吡喃葡萄糖苷(反式-diols)以及4,6- Ø -protected mannopyranosides(顺-二醇)。在温和的反应条件下,该反应产生高达81%的固有不利的2- O-乙酰化产物,选择性高达15:1。我们还确定了保护基对反应的影响,并证明我们的方案适用于具有多个连续保护步骤的一锅法反应。