A Concise Enantioselective Entry to the Synthesis of Deoxy-azasugars
作者:Rubén Martín、Albert Moyano、Miquel A. Pericàs、Antoni Riera
DOI:10.1021/ol991280u
日期:2000.1.1
[reaction: see text] A concise enantioselective preparation of oxazolidinylpiperidine 4, a key intermediate in the synthesis of glycosidase inhibitors such as 1-deoxymannojirimycin or 1-deoxygalactostatin, has been developed. Sharpless catalyticasymmetric epoxidation of (E)-2,4-pentadienol followed by treatment with allyl isocyanate afforded epoxy carbamate 8. Regioselective intramolecular ring opening
Novel Stereocontrolled Approach tosyn- andanti-Oxepene–Cyclogeranyltrans-Fused Polycyclic Systems: Asymmetric Total Synthesis of (−)-Aplysistatin, (+)-Palisadin A, (+)-Palisadin B, (+)-12-Hydroxy-Palisadin B, and the AB Ring System of Adociasulfate-2 and Toxicol A
作者:Elias A. Couladouros、Veroniki P. Vidali
DOI:10.1002/chem.200400407
日期:2004.8.6
the construction of trans-syn 6,7-ring systems. This approach leads to the synthesis of the AB fragment of Adociasulfate-2 and Toxicol A, for the first time. The flexibility and efficiency of the presented strategy is demonstrated by the total asymmetric synthesis of (-)-Aplysistatin, (+)-Palisadin A, (+)-12-hydroxy-Palisadin B, and (+)-Palisadin B, employing two similar key intermediates.
First enantioselective non-biological synthesis of asymmetrised tris(hydroxymethyl)methane (THYM*) and bis(hydroxymethyl)acetaldehyde (BHYMA*)
作者:Irene Izzo、Matteo Scioscia、Pasquale Del Gaudio、Francesco De Riccardis
DOI:10.1016/s0040-4039(01)01048-6
日期:2001.8
An asymmetric synthesis of a chiral non-racemic (O-benzyl, O′-silyl) derivative of the latent C3v-symmetric tris(hydroxymethyl)methane (THYM*) and of the bis(hydroxymethyl)acetaldehyde (BHYMA*) in 6 steps, 38% overall yield and 7 steps, 36% overall yield, respectively, is described starting from the commercially available 4-nitrobenzoate derivative of 17. The method involves the Sharpless asymmetric
手性非外消旋(的不对称合成ø -苄基,O' -甲硅烷)衍生物的潜的Ç 3 v -对称三(羟甲基)甲烷(THYM *)和双(羟甲基)乙醛(BHYMA *)中从市售的4-硝基苯甲酸酯衍生物17开始分别描述了6步,总产率为38%和7步,总产率为36%。该方法涉及Sharpless不对称环氧化和区域选择性铜介导的环氧乙烷开环,这是关键步骤。
Preparation of (2R,3S)-1,2-epoxypent-4-en-3-ol, a new chiral building block for the synthesis of (+)-endo- and (–)-exo-brevicomin
Asymmetric epoxidation of the divinylcarbinol (7) using L-(+)-diethyl tartrate gave (2R,3S)-1,2-epoxypent-4-en-3-ol (8), which was utilized as a chiralbuildingblock in the synthesis of (+)-endo- and (–)-exo-brevicomin.