851900-51-1Relevant academic research and scientific papers
Toward the synthesis of modified carbohydrates by conjugate addition of propane-1,3-dithiol to α,β-unsaturated ketones
Valdersnes, Stig,Apeland, Ingrid,Flemmen, Guri,Sydnes, Leiv K.
, p. 2099 - 2122 (2013/02/22)
Selected 5-substituted derivatives 4 of 1,1-diethoxy-5-hydroxypent-3-yn-2- one were treated with propane-1,3-dithiol under various conditions. The unprotected hydroxy ketones underwent cyclization during the dithiol addition and gave the corresponding 3-(diethoxymethyl)-2-oxa-6,10-dithiaspiro[4.5]decan- 3-ols 5 in 80-90% yield as the only products (Schemea 3 and Tablea 1). These products can be regarded as partly modified carbohydrates in the furanose form. When the benzyl-protected analogues 10-Bn of the 1,1-diethoxy-5-hydroxypent-3- yn-2-one derivatives were treated with the same dithiol, however, no cyclization occurred; instead the corresponding 3-{2-[(benzyloxy)methyl]-1,3-dithian-2-yl}- 1,1-diethoxypropan-2-one derivatives 11-Bn were formed in good yield (up to 99%; Table 4). These 1,3-dithianes were and are in the process of being converted to a number of new carbohydrate analogues, and here are reported high-yield syntheses of functionalized molecules 17 belonging to the 5,5-diethoxy-1,4- dihydroxypentan-2-one family of compounds (Table 7), via 15-Bn (Table 5) and 16-Bn (Table 6 and Scheme 8).
New regiospecific synthesis of tri- and tetra-substituted furans
Sydnes, Leiv K.,Holmelid, Bjarte,Sengee, Myagmarsuren,Hanstein, Miriam
experimental part, p. 3430 - 3443 (2009/09/08)
β-Acyloxy α,β-unsaturated acetylenic ketones have been shown to react with organocuprate reagents and undergo cyclization followed by dehydration to give substituted furans as the final products. The transformation appeared to be versatile, and tri- and t
