An Expeditious Stereoselective Synthesis of (−)-Pinidinone from Ethyl Acetoacetate
作者:Kongara Damodar、Jong-Gab Jun
DOI:10.1002/bkcs.10728
日期:2016.4
An expeditious stereoselective synthesis of a naturally occurring 2,6‐disubstituted piperidine alkaloid, (−)‐pinidinone, has been accomplished with an overall yield of 31% in total eight steps. The synthesis involves ethyl acetoacetate as the starting material and the stereoselective α‐aminoallylation of aldehyde with (S)‐tert‐butanesulfinamide, allyl bromide, and indium and Grubbs’ olefin cross‐metathesis
申请人:Industry Academic Cooperation Foundation, Hallym University 한림대학교 산학협력단(220070195175) BRN ▼221-82-10284
公开号:KR101702870B1
公开(公告)日:2017-02-06
본 발명은 자연적으로 발생하는 2,6 위치의 작용기가 치환된 피페리딘 알칼로이드인 (-)-피니디논의 신속한 입체선택적 합성방법에 관한 것이다. 이 방법은 에틸 아세토아세테이트를 출발물질로 하며 알데하이드와 ( S )- tert -부탄설핀아마이드, 알릴 브로마이드, 인듐의 입체선택적 α-아미노알릴화 및 그럽스 올레핀 교차치환반응을 주요 단계로 한다.
The diastereoselective PdCl2/CuCl2-catalysed intramolecular methoxyaminocarbonylation of N-benzyl protected alkenyl amine 4 was used as a key step in the total synthesis of the naturally occurring piperidine alkaloid (−)-pinidinone. Commercially available (S)-propylene oxide was employed as starting material, delivering the key substrate 4 in three steps and 68% overall yield. Subsequently, the influence
The 2,6-disubstituted piperidine alkaloids (+)-dihydropinidine (1), (−)-epidihydropinidine (2) (as HCl salts), and (−)-pinidinone (3) were efficiently synthesized from (S)-epichlorohydrin (7) as common substrate using regioselective Wacker−Tsuji oxidation of alkenylazides 10 and 14 as well as a highly diastereoselective reduction of cyclic imine 11 as key steps. The protecting group free total syntheses
AbstractA simple and efficient stereoselective linear approach to the total synthesis of (−)‐pinidinone has been accomplished starting from propane‐1,3‐diol, and employing Maruoka asymmetric allylation and Grubbs' olefin cross‐metathesis as the key steps.