Syntheses of coenzyme Q(3-8) are described, as well as related systems such as plastoquinone-5. Preparation of thr higher homologues of the ubiquinones relies on two new conjunctive reagents, or "linchpins", each of which ultimately corresponds to two or three prenyl units. These allow for attachment of a polyprenyl halide at one end, followed by a Ni(0)-catalyzed cross-coupling at the other terminus with a chloromethylated p-quinone.
Studies on the non-mevalonate isoprenoid biosynthetic pathway. Simple methods for preparation of isotope-labeled (E)-1-hydroxy-2-methylbut-2-enyl 4-diphosphate
摘要:
(E)-1-羟基-2-甲基-2-烯基but-2-yl 4-二磷酸酯(6)作为isoprenoid生物合成途径的中间体,最近通过1-脱氧-D-木在外面5-磷酸酯的途径被检测出来。该化合物通过两步合成,底物起点为2-甲基-2-烯基氧环戊二烯酸酯,总体产率达到72%。本研究还报道了一种四种步骤的方法,使同一底物出发生成[1-H-3]-6和[1-H-2(1)]-6,其中氢同位素的引入均在最后一反应步骤中完成,起始材料用含 deuterated 或 tritiated 的 sodium borohydride 处理。The radiochemical yield of [1-H-3]-6 was 15%。 (C)2002 Elsevier Science Ltd。All rights reserved。
C5 설폰 화합물, 그의 제조방법 및, 이를 이용한 크로세틴 디니트릴 제조방법 및 그의 용도
申请人:Myongji University Industry and Academia Cooperation Foundation 명지대학교 산학협력단(220050139720) BRN ▼135-82-11060
公开号:KR20150115997A
公开(公告)日:2015-10-15
본 발명은 신규의 C5 설폰 화합물, 그 제조방법 및 이를 이용한 크로세틴 디니트릴 제조방법에 관한 것으로, 더욱 상세하게는 하이드라존 보호기를 갖는 신규의 C5 설폰 화합물, 그 제조방법과 이를 이용하여 크로세틴 디니트릴 화합물을 효율적으로 제조할 수 있는 방법에 관한 것이다. 본 발명에 따른 신규의 설폰 화합물은 안정하고, 결정성이 좋아 분리 정제가 용이하고, 이중 결합 형성시 E-구조 형성이 용이하다. 또한 상기 설폰 화합물을 이용하여 크로세틴 디니트릴을 합성하는 경우 결합 반응의 부산물인 설핀 산의 제거가 용이하기 때문에 순수한 최종 생성물을 효율적으로 얻을 수 있다. 본 발명에 따른 크로세틴 디니트릴 화합물은 카로틴 화합물의 일종으로 양 말단에 니트릴기를 함유하여 다양한 반응성을 기대할 수 있다. 또한 양 말단에 포함된 질소원자는 금속에 대한 친화력이 우수하기 때문에 금속 표면에 자기 조립이 가능하다. 아울러 카로틴의 일반적인 항산화 기능을 나타낼 수 있고 유기 분자 도선 등 전기 전자 재료로서도 사용이 가능하다.
Asymmetric Reductive Carbocyclization Using Engineered Ene Reductases
作者:Kathrin Heckenbichler、Anna Schweiger、Lea Alexandra Brandner、Alexandra Binter、Marina Toplak、Peter Macheroux、Karl Gruber、Rolf Breinbauer
DOI:10.1002/anie.201802962
日期:2018.6.11
bearing an electron‐withdrawing group, for example, a carbonyl group. This asymmetricreduction has been exploited for biocatalysis. Going beyond its canonical function, we show that members of this enzyme family can also catalyze the formation of C−C bonds. α,β‐Unsaturated aldehydes and ketones containing an additional electrophilic group undergo reductive cyclization. Mechanistically, the two‐electron‐reduced
INTERMEDIATES FOR THE PREPARATION OF BETA-SANTALOL
申请人:Chapuis Christian
公开号:US20130310609A1
公开(公告)日:2013-11-21
The present invention concerns a process for the preparation of a compound of formula (I) in the form of any one of its stereoisomers or mixtures thereof, and wherein the dotted line may represents an additional bond and R
a
represents a hydrogen atom or a Si(R
b
)
3
or (R
b
)
2
COH group, each R
b
representing C
1-6
alkyl group or a phenyl group. The invention concerns also the compound (I) as well as its use for the synthesis of β-santalol or of derivatives thereof.
本发明涉及一种制备式(I)化合物的过程,其形式可以是其任一立体异构体或它们的混合物,其中虚线可能表示额外的键,R
a
表示氢原子或Si(R
b
)
3
或(R
b
)
2
COH基团,每个R
b
代表C
1-6
烷基或苯基。该发明还涉及化合物(I)以及其用于合成β-香檀醇或其衍生物的用途。
New Access to Kainic Acid via Intramolecular Palladium-Catalyzed Allylic Alkylation
The formal synthesis of kainic acid was carried out in eleven steps. The key cyclization step was accomplished through an intramolecular palladium-catalyzedallylicalkylation of an allylic sulfone. Further functionalization of the resulting pyrrolidone -featured, inter alia, a N-heterocyclic carbene-copper hydride (NHC-CuH)-mediated stereoconvergent conjugate reduction.
An effective [1,4]-charge affinity inversion of sulfur functionalized isoprenes
作者:P.J.R. Nederlop、M.J. Moolenaar、E.R. De Waard、H.O. Huisman
DOI:10.1016/0040-4020(78)89028-0
日期:1978.1
Consecutive [1,2]- and [1,3]-migrations of the sulfurfunctionality convert the hydroxysulfoxide terpene building block 1a into the charge affinity inverted synthon 6 or the desulfurized chloro aldehyde 9a.