Serendipitous synthesis of 3-hydroxy tetrahydrofurans from tin catalyzed sulfonylation of acyclic 1,2,4-triols
摘要:
The reaction of syn-1,2,4-triols under sulfonylation conditions catalyzed by Bu2SnO (5 mol %) results in cyclization and the formation of 3-hydroxy tetrahydrofurans (56-85%) while the anti-1,2,4-triols react to give C1-O-sulfonyl derivatives in good yields (66-83%) and the cyclization product in poor yield (5-12%). A mechanism that justifies these observations is proposed to occur via the tosylation of the primary hydroxyl followed by an intramolecular tin acetal rearrangement to a 1,3-stannylene which then undergoes a 5-exo-tet-cyclization. The difference in rates of cyclization reactivity is due to the energetically more stable tin acetals of syn-1,3-diols compared to those of anti-1,3-diols. (C) 2012 Elsevier Ltd. All rights reserved.
Chiral building blocks from d-xylose and their application in synthesis of avocadotriol monoacetate
作者:Jian Gao、Zhi-Bin Zhen、Ya-Jun Jian、Yikang Wu
DOI:10.1016/j.tet.2008.07.103
日期:2008.9
Facile routes to several enantiomerically pure flexible chiralbuildingblocks carrying a hidden syn or anti 1,3-diolmotif were developed with the inexpensive and readily available carbohydrate d-xylose as the starting material. Application of the newly developed chiralbuildingblocks in total synthesis is exemplified through a synthesis of (2S,4S)- and (2S,4R)-avocadotriol. Both triols were selectively
以廉价且易于获得的碳水化合物d-木糖为原料,开发了通往带有对映体纯净的柔性手性结构单元的简便途径,这些手性结构单元具有隐藏的合成或反1,3-二醇基序。通过合成(2 S,4 S)-和(2 S,4 R)-鳄梨三醇来举例说明新开发的手性结构单元在总合成中的应用。用诺维信435 /乙酸乙烯酯高产率地将两种三醇选择性地在伯羟基上乙酰化。根据1 H NMR,旋光度和熔点数据的比较,将天然鳄梨三醇1-单乙酸酯定为(2 R,4 R)配置。
REDUCED SODIUM FOOD PRODUCT
申请人:GENERAL MILLS, INC.
公开号:EP3466930A1
公开(公告)日:2019-04-10
The present invention relates to the use of a compound according to Formula B3:
where:
R1 and R2 are each independently OH or C1-C3 alkoxy, and
R3 is selected from the group consisting of
(i) C10-C20 unsubstituted straight or branched chain alkenyl with one or more double bonds; and
(ii)
where X, Y and Z are independently CH, CH2, CO or CHOR5 where R5 is H or C1-C3 alkyl, provided that if one of X or Y are CH then Z is also CH, and where R4 is C1-C8 straight or branched chain unsubstituted alkyl or
where n is 1-5, provided that if R4 is C1-C8 straight or branched chain alkyl, then Y is CHOR5 where R5 is C1-C3 alkyl;
for substituting sodium chloride in food products.
本发明涉及根据式 B3 所述化合物的用途:
其中
R1 和 R2 各自独立地为 OH 或 C1-C3 烷氧基,以及
R3 选自以下组别
(i) 具有一个或多个双键的 C10-C20 未取代直链或支链烯基;和
(ii)
其中 X、Y 和 Z 独立地为 CH、CH2、CO 或 CHOR5,其中 R5 为 H 或 C1-C3 烷基,但如果 X 或 Y 之一为 CH,则 Z 也为 CH,且其中 R4 为 C1-C8 未取代的直链或支链烷基,或
其中 n 为 1-5,但如果 R4 为 C1-C8 直链或支链烷基,则 Y 为 CHOR5,其中 R5 为 C1-C3 烷基;
用于替代食品中的氯化钠。
Sugiyama, Takeyoshi; Sato, Akemi; Yamashita, Kyohei, Agricultural and Biological Chemistry, 1982, vol. 46, # 2, p. 481 - 486
[EN] REDUCED SODIUM FOOD PRODUCTS<br/>[FR] PRODUITS ALIMENTAIRES PAUVRES EN SODIUM
申请人:GEN MILLS INC
公开号:WO2014124193A1
公开(公告)日:2014-08-14
Naturally-derived compounds having various structures elicit the perception of salty taste, enhance the perception of salty taste of a salt, or act at one or more sodium channels. Food products may include such naturally-derived compounds, which may be used to reduce the sodium content, while imparting a similar level of saltiness.