A catalyst system comprising 10 mol % (Pd(OAc) and 20 mol % PPh3 effects the cyclisation of aryl halides onto proximate alkenes via 5-, 6-, and 7-exo-trig, and 7-endo-trig processes giving a variety of bridged-ring carbo- and hetero-cycles in excellent yield. Double bond isomerisation in the product is rarley encountered and may be suppressed by the addition of Tl(1) salts. One example of diastereospecific
An aldehyde of formula (I)
in the form of any one of its stereoisomers or a mixture thereof, wherein each dotted line, independently from each other, represents a single or double bond; n is 0 or 1; R
1
is a hydrogen atom or a methyl group; R
2
is a hydrogen atom or a methyl or ethyl group; and R
3
, which can be present in any of positions 2 to 6 of the cyclic moiety, is a hydrogen atom or a methyl or ethyl group, or a CH
2
group bridging positions 3 and 6. Also, the use of the aldehyde as perfuming ingredient to impart odor notes of the aldehyde, lily of the valley type.
Stereoselective Dehydroxyboration of Allylic Alcohols to Access (<i>E</i>)-Allylboronates by a Combination of C–OH Cleavage and Boron Transfer under Iron Catalysis
Iron-catalyzed direct SN2′ dehydroxyboration of allylic alcohols has been developed to access (E)-stereoselective allylboronates. Allylic alcohols with diverse structures and functional groups, especially derived from natural products, underwent smooth transformation. The six-membered ring transition state formed by allylic alcohols and iron–boron intermediate was indicated to be the key component
铁催化的烯丙醇直接 S N 2' 脱羟基硼酸已被开发用于获得 ( E )-立体选择性烯丙基硼酸酯。具有多种结构和官能团的烯丙醇,特别是来自天然产物的烯丙醇,经历了平稳的转变。由烯丙醇和铁-硼中间体形成的六元环过渡态被证明是参与硼基团转移、C-OH键活化和立体选择性控制的关键成分。
[EN] ALDEHYDES AS PERFUMING INGREDIENTS<br/>[FR] ALDÉHYDES EN TANT QU'INGRÉDIENTS DE PARFUM
申请人:FIRMENICH & CIE
公开号:WO2013117433A1
公开(公告)日:2013-08-15
The present invention relates to an aldehyde of formula (I) in the form of any one of its stereoisomers or a mixture thereof, and wherein each dotted line, independently from each other, represents a single or double bond; n is 0 or 1; R1 represents a hydrogen atom or a methyl group; R2 represents a hydrogen atom or a methyl or ethyl group; and R3, which is a substituent in any of the positions 2 to 6 of the cyclic moiety, represents a hydrogen atom or a methyl or ethyl group, or a CH2 group bridging positions 3 and 6; and its use as perfuming ingredient, for instance to impart odor notes of the aldehyde, lily of the valley type.